editors/sed.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * sed.c - very minimalist version of sed
   4  *
   5  * Copyright (C) 1999,2000,2001 by Lineo, inc. and Mark Whitley
   6  * Copyright (C) 1999,2000,2001 by Mark Whitley <markw@codepoet.org>
   7  * Copyright (C) 2002  Matt Kraai
   8  * Copyright (C) 2003 by Glenn McGrath
   9  * Copyright (C) 2003,2004 by Rob Landley <rob@landley.net>
  10  *
  11  * MAINTAINER: Rob Landley <rob@landley.net>
  12  *
  13  * Licensed under GPL version 2, see file LICENSE in this tarball for details.
  14  */
  15
  16 /* Code overview.
  17
  18   Files are laid out to avoid unnecessary function declarations.  So for
  19   example, every function add_cmd calls occurs before add_cmd in this file.
  20
  21   add_cmd() is called on each line of sed command text (from a file or from
  22   the command line).  It calls get_address() and parse_cmd_args().  The
  23   resulting sed_cmd_t structures are appended to a linked list
  24   (G.sed_cmd_head/G.sed_cmd_tail).
  25
  26   add_input_file() adds a FILE * to the list of input files.  We need to
  27   know all input sources ahead of time to find the last line for the $ match.
  28
  29   process_files() does actual sedding, reading data lines from each input FILE *
  30   (which could be stdin) and applying the sed command list (sed_cmd_head) to
  31   each of the resulting lines.
  32
  33   sed_main() is where external code calls into this, with a command line.
  34 */
  35
  36
  37 /*
  38         Supported features and commands in this version of sed:
  39
  40          - comments ('#')
  41          - address matching: num|/matchstr/[,num|/matchstr/|$]command
  42          - commands: (p)rint, (d)elete, (s)ubstitue (with g & I flags)
  43          - edit commands: (a)ppend, (i)nsert, (c)hange
  44          - file commands: (r)ead
  45          - backreferences in substitution expressions (\0, \1, \2...\9)
  46          - grouped commands: {cmd1;cmd2}
  47          - transliteration (y/source-chars/dest-chars/)
  48          - pattern space hold space storing / swapping (g, h, x)
  49          - labels / branching (: label, b, t, T)
  50
  51          (Note: Specifying an address (range) to match is *optional*; commands
  52          default to the whole pattern space if no specific address match was
  53          requested.)
  54
  55         Todo:
  56          - Create a wrapper around regex to make libc's regex conform with sed
  57
  58         Reference http://www.opengroup.org/onlinepubs/007904975/utilities/sed.html
  59 */
  60
  61 #include "libbb.h"
  62 #include "xregex.h"
  63
  64 /* Each sed command turns into one of these structures. */
  65 typedef struct sed_cmd_s {
  66         /* Ordered by alignment requirements: currently 36 bytes on x86 */
  67         struct sed_cmd_s *next; /* Next command (linked list, NULL terminated) */
  68
  69         /* address storage */
  70         regex_t *beg_match;     /* sed -e '/match/cmd' */
  71         regex_t *end_match;     /* sed -e '/match/,/end_match/cmd' */
  72         regex_t *sub_match;     /* For 's/sub_match/string/' */
  73         int beg_line;           /* 'sed 1p'   0 == apply commands to all lines */
  74         int end_line;           /* 'sed 1,3p' 0 == one line only. -1 = last line ($) */
  75
  76         FILE *sw_file;          /* File (sw) command writes to, -1 for none. */
  77         char *string;           /* Data string for (saicytb) commands. */
  78
  79         unsigned short which_match; /* (s) Which match to replace (0 for all) */
  80
  81         /* Bitfields (gcc won't group them if we don't) */
  82         unsigned invert:1;      /* the '!' after the address */
  83         unsigned in_match:1;    /* Next line also included in match? */
  84         unsigned sub_p:1;       /* (s) print option */
  85
  86         char sw_last_char;      /* Last line written by (sw) had no '\n' */
  87
  88         /* GENERAL FIELDS */
  89         char cmd;               /* The command char: abcdDgGhHilnNpPqrstwxy:={} */
  90 } sed_cmd_t;
  91
  92 static const char semicolon_whitespace[] ALIGN1 = "; \n\r\t\v";
  93
  94 struct globals {
  95         /* options */
  96         int be_quiet, regex_type;
  97         FILE *nonstdout;
  98         char *outname, *hold_space;
  99
 100         /* List of input files */
 101         int input_file_count, current_input_file;
 102         FILE **input_file_list;
 103
 104         regmatch_t regmatch[10];
 105         regex_t *previous_regex_ptr;
 106
 107         /* linked list of sed commands */
 108         sed_cmd_t sed_cmd_head, *sed_cmd_tail;
 109
 110         /* Linked list of append lines */
 111         llist_t *append_head;
 112
 113         char *add_cmd_line;
 114
 115         struct pipeline {
 116                 char *buf;      /* Space to hold string */
 117                 int idx;        /* Space used */
 118                 int len;        /* Space allocated */
 119         } pipeline;
 120 };
 121 #define G (*(struct globals*)&bb_common_bufsiz1)
 122 void BUG_sed_globals_too_big(void);
 123 #define INIT_G() do { \
 124         if (sizeof(struct globals) > COMMON_BUFSIZE) \
 125                 BUG_sed_globals_too_big(); \
 126         G.sed_cmd_tail = &G.sed_cmd_head; \
 127 } while (0)
 128
 129
 130 #if ENABLE_FEATURE_CLEAN_UP
 131 static void sed_free_and_close_stuff(void)
 132 {
 133         sed_cmd_t *sed_cmd = G.sed_cmd_head.next;
 134
 135         llist_free(G.append_head, free);
 136
 137         while (sed_cmd) {
 138                 sed_cmd_t *sed_cmd_next = sed_cmd->next;
 139
 140                 if (sed_cmd->sw_file)
 141                         xprint_and_close_file(sed_cmd->sw_file);
 142
 143                 if (sed_cmd->beg_match) {
 144                         regfree(sed_cmd->beg_match);
 145                         free(sed_cmd->beg_match);
 146                 }
 147                 if (sed_cmd->end_match) {
 148                         regfree(sed_cmd->end_match);
 149                         free(sed_cmd->end_match);
 150                 }
 151                 if (sed_cmd->sub_match) {
 152                         regfree(sed_cmd->sub_match);
 153                         free(sed_cmd->sub_match);
 154                 }
 155                 free(sed_cmd->string);
 156                 free(sed_cmd);
 157                 sed_cmd = sed_cmd_next;
 158         }
 159
 160         free(G.hold_space);
 161
 162         while (G.current_input_file < G.input_file_count)
 163                 fclose(G.input_file_list[G.current_input_file++]);
 164 }
 165 #else
 166 void sed_free_and_close_stuff(void);
 167 #endif
 168
 169 /* If something bad happens during -i operation, delete temp file */
 170
 171 static void cleanup_outname(void)
 172 {
 173         if (G.outname) unlink(G.outname);
 174 }
 175
 176 /* strdup, replacing "\n" with '\n', and "\delimiter" with 'delimiter' */
 177
 178 static void parse_escapes(char *dest, const char *string, int len, char from, char to)
 179 {
 180         int i = 0;
 181
 182         while (i < len) {
 183                 if (string[i] == '\\') {
 184                         if (!to || string[i+1] == from) {
 185                                 *dest++ = to ? to : string[i+1];
 186                                 i += 2;
 187                                 continue;
 188                         }
 189                         *dest++ = string[i++];
 190                 }
 191                 *dest++ = string[i++];
 192         }
 193         *dest = 0;
 194 }
 195
 196 static char *copy_parsing_escapes(const char *string, int len)
 197 {
 198         char *dest = xmalloc(len + 1);
 199
 200         parse_escapes(dest, string, len, 'n', '\n');
 201         return dest;
 202 }
 203
 204
 205 /*
 206  * index_of_next_unescaped_regexp_delim - walks left to right through a string
 207  * beginning at a specified index and returns the index of the next regular
 208  * expression delimiter (typically a forward * slash ('/')) not preceded by
 209  * a backslash ('\').  A negative delimiter disables square bracket checking.
 210  */
 211 static int index_of_next_unescaped_regexp_delim(int delimiter, const char *str)
 212 {
 213         int bracket = -1;
 214         int escaped = 0;
 215         int idx = 0;
 216         char ch;
 217
 218         if (delimiter < 0) {
 219                 bracket--;
 220                 delimiter = -delimiter;
 221         }
 222
 223         for (; (ch = str[idx]); idx++) {
 224                 if (bracket >= 0) {
 225                         if (ch == ']' && !(bracket == idx - 1 || (bracket == idx - 2
 226                                         && str[idx - 1] == '^')))
 227                                 bracket = -1;
 228                 } else if (escaped)
 229                         escaped = 0;
 230                 else if (ch == '\\')
 231                         escaped = 1;
 232                 else if (bracket == -1 && ch == '[')
 233                         bracket = idx;
 234                 else if (ch == delimiter)
 235                         return idx;
 236         }
 237
 238         /* if we make it to here, we've hit the end of the string */
 239         bb_error_msg_and_die("unmatched '%c'", delimiter);
 240 }
 241
 242 /*
 243  *  Returns the index of the third delimiter
 244  */
 245 static int parse_regex_delim(const char *cmdstr, char **match, char **replace)
 246 {
 247         const char *cmdstr_ptr = cmdstr;
 248         char delimiter;
 249         int idx = 0;
 250
 251         /* verify that the 's' or 'y' is followed by something.  That something
 252          * (typically a 'slash') is now our regexp delimiter... */
 253         if (*cmdstr == '\0')
 254                 bb_error_msg_and_die("bad format in substitution expression");
 255         delimiter = *cmdstr_ptr++;
 256
 257         /* save the match string */
 258         idx = index_of_next_unescaped_regexp_delim(delimiter, cmdstr_ptr);
 259         *match = copy_parsing_escapes(cmdstr_ptr, idx);
 260
 261         /* save the replacement string */
 262         cmdstr_ptr += idx + 1;
 263         idx = index_of_next_unescaped_regexp_delim(-delimiter, cmdstr_ptr);
 264         *replace = copy_parsing_escapes(cmdstr_ptr, idx);
 265
 266         return ((cmdstr_ptr - cmdstr) + idx);
 267 }
 268
 269 /*
 270  * returns the index in the string just past where the address ends.
 271  */
 272 static int get_address(const char *my_str, int *linenum, regex_t ** regex)
 273 {
 274         const char *pos = my_str;
 275
 276         if (isdigit(*my_str)) {
 277                 *linenum = strtol(my_str, (char**)&pos, 10);
 278                 /* endstr shouldnt ever equal NULL */
 279         } else if (*my_str == '$') {
 280                 *linenum = -1;
 281                 pos++;
 282         } else if (*my_str == '/' || *my_str == '\\') {
 283                 int next;
 284                 char delimiter;
 285                 char *temp;
 286
 287                 delimiter = '/';
 288                 if (*my_str == '\\') delimiter = *++pos;
 289                 next = index_of_next_unescaped_regexp_delim(delimiter, ++pos);
 290                 temp = copy_parsing_escapes(pos, next);
 291                 *regex = xmalloc(sizeof(regex_t));
 292                 xregcomp(*regex, temp, G.regex_type|REG_NEWLINE);
 293                 free(temp);
 294                 /* Move position to next character after last delimiter */
 295                 pos += (next+1);
 296         }
 297         return pos - my_str;
 298 }
 299
 300 /* Grab a filename.  Whitespace at start is skipped, then goes to EOL. */
 301 static int parse_file_cmd(sed_cmd_t *sed_cmd, const char *filecmdstr, char **retval)
 302 {
 303         int start = 0, idx, hack = 0;
 304
 305         /* Skip whitespace, then grab filename to end of line */
 306         while (isspace(filecmdstr[start]))
 307                 start++;
 308         idx = start;
 309         while (filecmdstr[idx] && filecmdstr[idx] != '\n')
 310                 idx++;
 311
 312         /* If lines glued together, put backslash back. */
 313         if (filecmdstr[idx] == '\n')
 314                 hack = 1;
 315         if (idx == start)
 316                 bb_error_msg_and_die("empty filename");
 317         *retval = xstrndup(filecmdstr+start, idx-start+hack+1);
 318         if (hack)
 319                 (*retval)[idx] = '\\';
 320
 321         return idx;
 322 }
 323
 324 static int parse_subst_cmd(sed_cmd_t *sed_cmd, const char *substr)
 325 {
 326         int cflags = G.regex_type;
 327         char *match;
 328         int idx;
 329
 330         /*
 331          * A substitution command should look something like this:
 332          *    s/match/replace/ #gIpw
 333          *    ||     |        |||
 334          *    mandatory       optional
 335          */
 336         idx = parse_regex_delim(substr, &match, &sed_cmd->string);
 337
 338         /* determine the number of back references in the match string */
 339         /* Note: we compute this here rather than in the do_subst_command()
 340          * function to save processor time, at the expense of a little more memory
 341          * (4 bits) per sed_cmd */
 342
 343         /* process the flags */
 344
 345         sed_cmd->which_match = 1;
 346         while (substr[++idx]) {
 347                 /* Parse match number */
 348                 if (isdigit(substr[idx])) {
 349                         if (match[0] != '^') {
 350                                 /* Match 0 treated as all, multiple matches we take the last one. */
 351                                 const char *pos = substr + idx;
 352 /* FIXME: error check? */
 353                                 sed_cmd->which_match = (unsigned short)strtol(substr+idx, (char**) &pos, 10);
 354                                 idx = pos - substr;
 355                         }
 356                         continue;
 357                 }
 358                 /* Skip spaces */
 359                 if (isspace(substr[idx])) continue;
 360
 361                 switch (substr[idx]) {
 362                 /* Replace all occurrences */
 363                 case 'g':
 364                         if (match[0] != '^') sed_cmd->which_match = 0;
 365                         break;
 366                 /* Print pattern space */
 367                 case 'p':
 368                         sed_cmd->sub_p = 1;
 369                         break;
 370                 /* Write to file */
 371                 case 'w':
 372                 {
 373                         char *temp;
 374                         idx += parse_file_cmd(sed_cmd, substr+idx, &temp);
 375                         break;
 376                 }
 377                 /* Ignore case (gnu exension) */
 378                 case 'I':
 379                         cflags |= REG_ICASE;
 380                         break;
 381                 /* Comment */
 382                 case '#':
 383                         while (substr[++idx]) /*skip all*/;
 384                         /* Fall through */
 385                 /* End of command */
 386                 case ';':
 387                 case '}':
 388                         goto out;
 389                 default:
 390                         bb_error_msg_and_die("bad option in substitution expression");
 391                 }
 392         }
 393 out:
 394         /* compile the match string into a regex */
 395         if (*match != '\0') {
 396                 /* If match is empty, we use last regex used at runtime */
 397                 sed_cmd->sub_match = xmalloc(sizeof(regex_t));
 398                 xregcomp(sed_cmd->sub_match, match, cflags);
 399         }
 400         free(match);
 401
 402         return idx;
 403 }
 404
 405 /*
 406  *  Process the commands arguments
 407  */
 408 static const char *parse_cmd_args(sed_cmd_t *sed_cmd, const char *cmdstr)
 409 {
 410         /* handle (s)ubstitution command */
 411         if (sed_cmd->cmd == 's')
 412                 cmdstr += parse_subst_cmd(sed_cmd, cmdstr);
 413         /* handle edit cmds: (a)ppend, (i)nsert, and (c)hange */
 414         else if (strchr("aic", sed_cmd->cmd)) {
 415                 if ((sed_cmd->end_line || sed_cmd->end_match) && sed_cmd->cmd != 'c')
 416                         bb_error_msg_and_die
 417                                 ("only a beginning address can be specified for edit commands");
 418                 for (;;) {
 419                         if (*cmdstr == '\n' || *cmdstr == '\\') {
 420                                 cmdstr++;
 421                                 break;
 422                         } else if (isspace(*cmdstr))
 423                                 cmdstr++;
 424                         else
 425                                 break;
 426                 }
 427                 sed_cmd->string = xstrdup(cmdstr);
 428                 parse_escapes(sed_cmd->string, sed_cmd->string, strlen(cmdstr), 0, 0);
 429                 cmdstr += strlen(cmdstr);
 430         /* handle file cmds: (r)ead */
 431         } else if (strchr("rw", sed_cmd->cmd)) {
 432                 if (sed_cmd->end_line || sed_cmd->end_match)
 433                         bb_error_msg_and_die("command only uses one address");
 434                 cmdstr += parse_file_cmd(sed_cmd, cmdstr, &sed_cmd->string);
 435                 if (sed_cmd->cmd == 'w') {
 436                         sed_cmd->sw_file = xfopen(sed_cmd->string, "w");
 437                         sed_cmd->sw_last_char = '\n';
 438                 }
 439         /* handle branch commands */
 440         } else if (strchr(":btT", sed_cmd->cmd)) {
 441                 int length;
 442
 443                 cmdstr = skip_whitespace(cmdstr);
 444                 length = strcspn(cmdstr, semicolon_whitespace);
 445                 if (length) {
 446                         sed_cmd->string = xstrndup(cmdstr, length);
 447                         cmdstr += length;
 448                 }
 449         }
 450         /* translation command */
 451         else if (sed_cmd->cmd == 'y') {
 452                 char *match, *replace;
 453                 int i = cmdstr[0];
 454
 455                 cmdstr += parse_regex_delim(cmdstr, &match, &replace)+1;
 456                 /* \n already parsed, but \delimiter needs unescaping. */
 457                 parse_escapes(match, match, strlen(match), i, i);
 458                 parse_escapes(replace, replace, strlen(replace), i, i);
 459
 460                 sed_cmd->string = xzalloc((strlen(match) + 1) * 2);
 461                 for (i = 0; match[i] && replace[i]; i++) {
 462                         sed_cmd->string[i*2] = match[i];
 463                         sed_cmd->string[i*2+1] = replace[i];
 464                 }
 465                 free(match);
 466                 free(replace);
 467         }
 468         /* if it wasnt a single-letter command that takes no arguments
 469          * then it must be an invalid command.
 470          */
 471         else if (strchr("dDgGhHlnNpPqx={}", sed_cmd->cmd) == 0) {
 472                 bb_error_msg_and_die("unsupported command %c", sed_cmd->cmd);
 473         }
 474
 475         /* give back whatever's left over */
 476         return cmdstr;
 477 }
 478
 479
 480 /* Parse address+command sets, skipping comment lines. */
 481
 482 static void add_cmd(const char *cmdstr)
 483 {
 484         sed_cmd_t *sed_cmd;
 485         int temp;
 486
 487         /* Append this line to any unfinished line from last time. */
 488         if (G.add_cmd_line) {
 489                 char *tp = xasprintf("%s\n%s", G.add_cmd_line, cmdstr);
 490                 free(G.add_cmd_line);
 491                 cmdstr = G.add_cmd_line = tp;
 492         }
 493
 494         /* If this line ends with backslash, request next line. */
 495         temp = strlen(cmdstr);
 496         if (temp && cmdstr[--temp] == '\\') {
 497                 if (!G.add_cmd_line)
 498                         G.add_cmd_line = xstrdup(cmdstr);
 499                 G.add_cmd_line[temp] = '\0';
 500                 return;
 501         }
 502
 503         /* Loop parsing all commands in this line. */
 504         while (*cmdstr) {
 505                 /* Skip leading whitespace and semicolons */
 506                 cmdstr += strspn(cmdstr, semicolon_whitespace);
 507
 508                 /* If no more commands, exit. */
 509                 if (!*cmdstr) break;
 510
 511                 /* if this is a comment, jump past it and keep going */
 512                 if (*cmdstr == '#') {
 513                         /* "#n" is the same as using -n on the command line */
 514                         if (cmdstr[1] == 'n')
 515                                 G.be_quiet++;
 516                         cmdstr = strpbrk(cmdstr, "\n\r");
 517                         if (!cmdstr) break;
 518                         continue;
 519                 }
 520
 521                 /* parse the command
 522                  * format is: [addr][,addr][!]cmd
 523                  *            |----||-----||-|
 524                  *            part1 part2  part3
 525                  */
 526
 527                 sed_cmd = xzalloc(sizeof(sed_cmd_t));
 528
 529                 /* first part (if present) is an address: either a '$', a number or a /regex/ */
 530                 cmdstr += get_address(cmdstr, &sed_cmd->beg_line, &sed_cmd->beg_match);
 531
 532                 /* second part (if present) will begin with a comma */
 533                 if (*cmdstr == ',') {
 534                         int idx;
 535
 536                         cmdstr++;
 537                         idx = get_address(cmdstr, &sed_cmd->end_line, &sed_cmd->end_match);
 538                         if (!idx)
 539                                 bb_error_msg_and_die("no address after comma");
 540                         cmdstr += idx;
 541                 }
 542
 543                 /* skip whitespace before the command */
 544                 cmdstr = skip_whitespace(cmdstr);
 545
 546                 /* Check for inversion flag */
 547                 if (*cmdstr == '!') {
 548                         sed_cmd->invert = 1;
 549                         cmdstr++;
 550
 551                         /* skip whitespace before the command */
 552                         cmdstr = skip_whitespace(cmdstr);
 553                 }
 554
 555                 /* last part (mandatory) will be a command */
 556                 if (!*cmdstr)
 557                         bb_error_msg_and_die("missing command");
 558                 sed_cmd->cmd = *(cmdstr++);
 559                 cmdstr = parse_cmd_args(sed_cmd, cmdstr);
 560
 561                 /* Add the command to the command array */
 562                 G.sed_cmd_tail->next = sed_cmd;
 563                 G.sed_cmd_tail = G.sed_cmd_tail->next;
 564         }
 565
 566         /* If we glued multiple lines together, free the memory. */
 567         free(G.add_cmd_line);
 568         G.add_cmd_line = NULL;
 569 }
 570
 571 /* Append to a string, reallocating memory as necessary. */
 572
 573 #define PIPE_GROW 64
 574
 575 static void pipe_putc(char c)
 576 {
 577         if (G.pipeline.idx == G.pipeline.len) {
 578                 G.pipeline.buf = xrealloc(G.pipeline.buf,
 579                                 G.pipeline.len + PIPE_GROW);
 580                 G.pipeline.len += PIPE_GROW;
 581         }
 582         G.pipeline.buf[G.pipeline.idx++] = c;
 583 }
 584
 585 static void do_subst_w_backrefs(char *line, char *replace)
 586 {
 587         int i,j;
 588
 589         /* go through the replacement string */
 590         for (i = 0; replace[i]; i++) {
 591                 /* if we find a backreference (\1, \2, etc.) print the backref'ed * text */
 592                 if (replace[i] == '\\') {
 593                         unsigned backref = replace[++i] - '0';
 594                         if (backref <= 9) {
 595                                 /* print out the text held in G.regmatch[backref] */
 596                                 if (G.regmatch[backref].rm_so != -1) {
 597                                         j = G.regmatch[backref].rm_so;
 598                                         while (j < G.regmatch[backref].rm_eo)
 599                                                 pipe_putc(line[j++]);
 600                                 }
 601                                 continue;
 602                         }
 603                         /* I _think_ it is impossible to get '\' to be
 604                          * the last char in replace string. Thus we dont check
 605                          * for replace[i] == NUL. (counterexample anyone?) */
 606                         /* if we find a backslash escaped character, print the character */
 607                         pipe_putc(replace[i]);
 608                         continue;
 609                 }
 610                 /* if we find an unescaped '&' print out the whole matched text. */
 611                 if (replace[i] == '&') {
 612                         j = G.regmatch[0].rm_so;
 613                         while (j < G.regmatch[0].rm_eo)
 614                                 pipe_putc(line[j++]);
 615                         continue;
 616                 }
 617                 /* Otherwise just output the character. */
 618                 pipe_putc(replace[i]);
 619         }
 620 }
 621
 622 static int do_subst_command(sed_cmd_t *sed_cmd, char **line)
 623 {
 624         char *oldline = *line;
 625         int altered = 0;
 626         int match_count = 0;
 627         regex_t *current_regex;
 628
 629         /* Handle empty regex. */
 630         if (sed_cmd->sub_match == NULL) {
 631                 current_regex = G.previous_regex_ptr;
 632                 if (!current_regex)
 633                         bb_error_msg_and_die("no previous regexp");
 634         } else
 635                 G.previous_regex_ptr = current_regex = sed_cmd->sub_match;
 636
 637         /* Find the first match */
 638         if (REG_NOMATCH == regexec(current_regex, oldline, 10, G.regmatch, 0))
 639                 return 0;
 640
 641         /* Initialize temporary output buffer. */
 642         G.pipeline.buf = xmalloc(PIPE_GROW);
 643         G.pipeline.len = PIPE_GROW;
 644         G.pipeline.idx = 0;
 645
 646         /* Now loop through, substituting for matches */
 647         do {
 648                 int i;
 649
 650                 /* Work around bug in glibc regexec, demonstrated by:
 651                    echo " a.b" | busybox sed 's [^ .]* x g'
 652                    The match_count check is so not to break
 653                    echo "hi" | busybox sed 's/^/!/g' */
 654                 if (!G.regmatch[0].rm_so && !G.regmatch[0].rm_eo && match_count) {
 655                         pipe_putc(*oldline++);
 656                         continue;
 657                 }
 658
 659                 match_count++;
 660
 661                 /* If we aren't interested in this match, output old line to
 662                    end of match and continue */
 663                 if (sed_cmd->which_match && sed_cmd->which_match != match_count) {
 664                         for (i = 0; i < G.regmatch[0].rm_eo; i++)
 665                                 pipe_putc(*oldline++);
 666                         continue;
 667                 }
 668
 669                 /* print everything before the match */
 670                 for (i = 0; i < G.regmatch[0].rm_so; i++)
 671                         pipe_putc(oldline[i]);
 672
 673                 /* then print the substitution string */
 674                 do_subst_w_backrefs(oldline, sed_cmd->string);
 675
 676                 /* advance past the match */
 677                 oldline += G.regmatch[0].rm_eo;
 678                 /* flag that something has changed */
 679                 altered++;
 680
 681                 /* if we're not doing this globally, get out now */
 682                 if (sed_cmd->which_match) break;
 683         } while (*oldline && (regexec(current_regex, oldline, 10, G.regmatch, 0) != REG_NOMATCH));
 684
 685         /* Copy rest of string into output pipeline */
 686
 687         while (*oldline)
 688                 pipe_putc(*oldline++);
 689         pipe_putc(0);
 690
 691         free(*line);
 692         *line = G.pipeline.buf;
 693         return altered;
 694 }
 695
 696 /* Set command pointer to point to this label.  (Does not handle null label.) */
 697 static sed_cmd_t *branch_to(char *label)
 698 {
 699         sed_cmd_t *sed_cmd;
 700
 701         for (sed_cmd = G.sed_cmd_head.next; sed_cmd; sed_cmd = sed_cmd->next) {
 702                 if (sed_cmd->cmd == ':' && sed_cmd->string && !strcmp(sed_cmd->string, label)) {
 703                         return sed_cmd;
 704                 }
 705         }
 706         bb_error_msg_and_die("can't find label for jump to '%s'", label);
 707 }
 708
 709 static void append(char *s)
 710 {
 711         llist_add_to_end(&G.append_head, xstrdup(s));
 712 }
 713
 714 static void flush_append(void)
 715 {
 716         char *data;
 717
 718         /* Output appended lines. */
 719         while ((data = (char *)llist_pop(&G.append_head))) {
 720                 fprintf(G.nonstdout, "%s\n", data);
 721                 free(data);
 722         }
 723 }
 724
 725 static void add_input_file(FILE *file)
 726 {
 727         G.input_file_list = xrealloc(G.input_file_list,
 728                         (G.input_file_count + 1) * sizeof(FILE *));
 729         G.input_file_list[G.input_file_count++] = file;
 730 }
 731
 732 /* Get next line of input from G.input_file_list, flushing append buffer and
 733  * noting if we ran out of files without a newline on the last line we read.
 734  */
 735 enum {
 736         NO_EOL_CHAR = 1,
 737         LAST_IS_NUL = 2,
 738 };
 739 static char *get_next_line(char *gets_char)
 740 {
 741         char *temp = NULL;
 742         int len;
 743         char gc;
 744
 745         flush_append();
 746
 747         /* will be returned if last line in the file
 748          * doesn't end with either '\n' or '\0' */
 749         gc = NO_EOL_CHAR;
 750         while (G.current_input_file < G.input_file_count) {
 751                 FILE *fp = G.input_file_list[G.current_input_file];
 752                 /* Read line up to a newline or NUL byte, inclusive,
 753                  * return malloc'ed char[]. length of the chunk read
 754                  * is stored in len. NULL if EOF/error */
 755                 temp = bb_get_chunk_from_file(fp, &len);
 756                 if (temp) {
 757                         /* len > 0 here, it's ok to do temp[len-1] */
 758                         char c = temp[len-1];
 759                         if (c == '\n' || c == '\0') {
 760                                 temp[len-1] = '\0';
 761                                 gc = c;
 762                                 if (c == '\0') {
 763                                         int ch = fgetc(fp);
 764                                         if (ch != EOF)
 765                                                 ungetc(ch, fp);
 766                                         else
 767                                                 gc = LAST_IS_NUL;
 768                                 }
 769                         }
 770                         /* else we put NO_EOL_CHAR into *gets_char */
 771                         break;
 772
 773                 /* NB: I had the idea of peeking next file(s) and returning
 774                  * NO_EOL_CHAR only if it is the *last* non-empty
 775                  * input file. But there is a case where this won't work:
 776                  * file1: "a woo\nb woo"
 777                  * file2: "c no\nd no"
 778                  * sed -ne 's/woo/bang/p' input1 input2 => "a bang\nb bang"
 779                  * (note: *no* newline after "b bang"!) */
 780                 }
 781                 /* Close this file and advance to next one */
 782                 fclose(fp);
 783                 G.current_input_file++;
 784         }
 785         *gets_char = gc;
 786         return temp;
 787 }
 788
 789 /* Output line of text. */
 790 /* Note:
 791  * The tricks with NO_EOL_CHAR and last_puts_char are there to emulate gnu sed.
 792  * Without them, we had this:
 793  * echo -n thingy >z1
 794  * echo -n again >z2
 795  * >znull
 796  * sed "s/i/z/" z1 z2 znull | hexdump -vC
 797  * output:
 798  * gnu sed 4.1.5:
 799  * 00000000  74 68 7a 6e 67 79 0a 61  67 61 7a 6e              |thzngy.agazn|
 800  * bbox:
 801  * 00000000  74 68 7a 6e 67 79 61 67  61 7a 6e                 |thzngyagazn|
 802  */
 803 static void puts_maybe_newline(char *s, FILE *file, char *last_puts_char, char last_gets_char)
 804 {
 805         char lpc = *last_puts_char;
 806
 807         /* Need to insert a '\n' between two files because first file's
 808          * last line wasn't terminated? */
 809         if (lpc != '\n' && lpc != '\0') {
 810                 fputc('\n', file);
 811                 lpc = '\n';
 812         }
 813         fputs(s, file);
 814
 815         /* 'x' - just something which is not '\n', '\0' or NO_EOL_CHAR */
 816         if (s[0])
 817                 lpc = 'x';
 818
 819         /* had trailing '\0' and it was last char of file? */
 820         if (last_gets_char == LAST_IS_NUL) {
 821                 fputc('\0', file);
 822                 lpc = 'x'; /* */
 823         } else
 824         /* had trailing '\n' or '\0'? */
 825         if (last_gets_char != NO_EOL_CHAR) {
 826                 fputc(last_gets_char, file);
 827                 lpc = last_gets_char;
 828         }
 829
 830         if (ferror(file)) {
 831                 xfunc_error_retval = 4;  /* It's what gnu sed exits with... */
 832                 bb_error_msg_and_die(bb_msg_write_error);
 833         }
 834         *last_puts_char = lpc;
 835 }
 836
 837 #define sed_puts(s, n) (puts_maybe_newline(s, G.nonstdout, &last_puts_char, n))
 838
 839 static int beg_match(sed_cmd_t *sed_cmd, const char *pattern_space)
 840 {
 841         int retval = sed_cmd->beg_match && !regexec(sed_cmd->beg_match, pattern_space, 0, NULL, 0);
 842         if (retval)
 843                 G.previous_regex_ptr = sed_cmd->beg_match;
 844         return retval;
 845 }
 846
 847 /* Process all the lines in all the files */
 848
 849 static void process_files(void)
 850 {
 851         char *pattern_space, *next_line;
 852         int linenum = 0;
 853         char last_puts_char = '\n';
 854         char last_gets_char, next_gets_char;
 855         sed_cmd_t *sed_cmd;
 856         int substituted;
 857
 858         /* Prime the pump */
 859         next_line = get_next_line(&next_gets_char);
 860
 861         /* go through every line in each file */
 862 again:
 863         substituted = 0;
 864
 865         /* Advance to next line.  Stop if out of lines. */
 866         pattern_space = next_line;
 867         if (!pattern_space) return;
 868         last_gets_char = next_gets_char;
 869
 870         /* Read one line in advance so we can act on the last line,
 871          * the '$' address */
 872         next_line = get_next_line(&next_gets_char);
 873         linenum++;
 874 restart:
 875         /* for every line, go through all the commands */
 876         for (sed_cmd = G.sed_cmd_head.next; sed_cmd; sed_cmd = sed_cmd->next) {
 877                 int old_matched, matched;
 878
 879                 old_matched = sed_cmd->in_match;
 880
 881                 /* Determine if this command matches this line: */
 882
 883                 /* Are we continuing a previous multi-line match? */
 884                 sed_cmd->in_match = sed_cmd->in_match
 885                         /* Or is no range necessary? */
 886                         || (!sed_cmd->beg_line && !sed_cmd->end_line
 887                                 && !sed_cmd->beg_match && !sed_cmd->end_match)
 888                         /* Or did we match the start of a numerical range? */
 889                         || (sed_cmd->beg_line > 0 && (sed_cmd->beg_line == linenum))
 890                         /* Or does this line match our begin address regex? */
 891                         || (beg_match(sed_cmd, pattern_space))
 892                         /* Or did we match last line of input? */
 893                         || (sed_cmd->beg_line == -1 && next_line == NULL);
 894
 895                 /* Snapshot the value */
 896
 897                 matched = sed_cmd->in_match;
 898
 899                 /* Is this line the end of the current match? */
 900
 901                 if (matched) {
 902                         sed_cmd->in_match = !(
 903                                 /* has the ending line come, or is this a single address command? */
 904                                 (sed_cmd->end_line ?
 905                                         sed_cmd->end_line == -1 ?
 906                                                 !next_line
 907                                                 : (sed_cmd->end_line <= linenum)
 908                                         : !sed_cmd->end_match
 909                                 )
 910                                 /* or does this line matches our last address regex */
 911                                 || (sed_cmd->end_match && old_matched
 912                                      && (regexec(sed_cmd->end_match,
 913                                                  pattern_space, 0, NULL, 0) == 0))
 914                         );
 915                 }
 916
 917                 /* Skip blocks of commands we didn't match. */
 918                 if (sed_cmd->cmd == '{') {
 919                         if (sed_cmd->invert ? matched : !matched) {
 920                                 while (sed_cmd->cmd != '}') {
 921                                         sed_cmd = sed_cmd->next;
 922                                         if (!sed_cmd)
 923                                                 bb_error_msg_and_die("unterminated {");
 924                                 }
 925                         }
 926                         continue;
 927                 }
 928
 929                 /* Okay, so did this line match? */
 930                 if (sed_cmd->invert ? !matched : matched) {
 931                         /* Update last used regex in case a blank substitute BRE is found */
 932                         if (sed_cmd->beg_match) {
 933                                 G.previous_regex_ptr = sed_cmd->beg_match;
 934                         }
 935
 936                         /* actual sedding */
 937                         switch (sed_cmd->cmd) {
 938
 939                         /* Print line number */
 940                         case '=':
 941                                 fprintf(G.nonstdout, "%d\n", linenum);
 942                                 break;
 943
 944                         /* Write the current pattern space up to the first newline */
 945                         case 'P':
 946                         {
 947                                 char *tmp = strchr(pattern_space, '\n');
 948
 949                                 if (tmp) {
 950                                         *tmp = '\0';
 951                                         /* TODO: explain why '\n' below */
 952                                         sed_puts(pattern_space, '\n');
 953                                         *tmp = '\n';
 954                                         break;
 955                                 }
 956                                 /* Fall Through */
 957                         }
 958
 959                         /* Write the current pattern space to output */
 960                         case 'p':
 961                                 /* NB: we print this _before_ the last line
 962                                  * (of current file) is printed. Even if
 963                                  * that line is nonterminated, we print
 964                                  * '\n' here (gnu sed does the same) */
 965                                 sed_puts(pattern_space, '\n');
 966                                 break;
 967                         /* Delete up through first newline */
 968                         case 'D':
 969                         {
 970                                 char *tmp = strchr(pattern_space, '\n');
 971
 972                                 if (tmp) {
 973                                         tmp = xstrdup(tmp+1);
 974                                         free(pattern_space);
 975                                         pattern_space = tmp;
 976                                         goto restart;
 977                                 }
 978                         }
 979                         /* discard this line. */
 980                         case 'd':
 981                                 goto discard_line;
 982
 983                         /* Substitute with regex */
 984                         case 's':
 985                                 if (!do_subst_command(sed_cmd, &pattern_space))
 986                                         break;
 987                                 substituted |= 1;
 988
 989                                 /* handle p option */
 990                                 if (sed_cmd->sub_p)
 991                                         sed_puts(pattern_space, last_gets_char);
 992                                 /* handle w option */
 993                                 if (sed_cmd->sw_file)
 994                                         puts_maybe_newline(
 995                                                 pattern_space, sed_cmd->sw_file,
 996                                                 &sed_cmd->sw_last_char, last_gets_char);
 997                                 break;
 998
 999                         /* Append line to linked list to be printed later */
1000                         case 'a':
1001                                 append(sed_cmd->string);
1002                                 break;
1003
1004                         /* Insert text before this line */
1005                         case 'i':
1006                                 sed_puts(sed_cmd->string, '\n');
1007                                 break;
1008
1009                         /* Cut and paste text (replace) */
1010                         case 'c':
1011                                 /* Only triggers on last line of a matching range. */
1012                                 if (!sed_cmd->in_match)
1013                                         sed_puts(sed_cmd->string, NO_EOL_CHAR);
1014                                 goto discard_line;
1015
1016                         /* Read file, append contents to output */
1017                         case 'r':
1018                         {
1019                                 FILE *rfile;
1020
1021                                 rfile = fopen(sed_cmd->string, "r");
1022                                 if (rfile) {
1023                                         char *line;
1024
1025                                         while ((line = xmalloc_getline(rfile))
1026                                                         != NULL)
1027                                                 append(line);
1028                                         xprint_and_close_file(rfile);
1029                                 }
1030
1031                                 break;
1032                         }
1033
1034                         /* Write pattern space to file. */
1035                         case 'w':
1036                                 puts_maybe_newline(
1037                                         pattern_space, sed_cmd->sw_file,
1038                                         &sed_cmd->sw_last_char, last_gets_char);
1039                                 break;
1040
1041                         /* Read next line from input */
1042                         case 'n':
1043                                 if (!G.be_quiet)
1044                                         sed_puts(pattern_space, last_gets_char);
1045                                 if (next_line) {
1046                                         free(pattern_space);
1047                                         pattern_space = next_line;
1048                                         last_gets_char = next_gets_char;
1049                                         next_line = get_next_line(&next_gets_char);
1050                                         linenum++;
1051                                         break;
1052                                 }
1053                                 /* fall through */
1054
1055                         /* Quit.  End of script, end of input. */
1056                         case 'q':
1057                                 /* Exit the outer while loop */
1058                                 free(next_line);
1059                                 next_line = NULL;
1060                                 goto discard_commands;
1061
1062                         /* Append the next line to the current line */
1063                         case 'N':
1064                         {
1065                                 int len;
1066                                 /* If no next line, jump to end of script and exit. */
1067                                 if (next_line == NULL) {
1068                                         /* Jump to end of script and exit */
1069                                         free(next_line);
1070                                         next_line = NULL;
1071                                         goto discard_line;
1072                                 /* append next_line, read new next_line. */
1073                                 }
1074                                 len = strlen(pattern_space);
1075                                 pattern_space = realloc(pattern_space, len + strlen(next_line) + 2);
1076                                 pattern_space[len] = '\n';
1077                                 strcpy(pattern_space + len+1, next_line);
1078                                 last_gets_char = next_gets_char;
1079                                 next_line = get_next_line(&next_gets_char);
1080                                 linenum++;
1081                                 break;
1082                         }
1083
1084                         /* Test/branch if substitution occurred */
1085                         case 't':
1086                                 if (!substituted) break;
1087                                 substituted = 0;
1088                                 /* Fall through */
1089                         /* Test/branch if substitution didn't occur */
1090                         case 'T':
1091                                 if (substituted) break;
1092                                 /* Fall through */
1093                         /* Branch to label */
1094                         case 'b':
1095                                 if (!sed_cmd->string) goto discard_commands;
1096                                 else sed_cmd = branch_to(sed_cmd->string);
1097                                 break;
1098                         /* Transliterate characters */
1099                         case 'y':
1100                         {
1101                                 int i, j;
1102
1103                                 for (i = 0; pattern_space[i]; i++) {
1104                                         for (j = 0; sed_cmd->string[j]; j += 2) {
1105                                                 if (pattern_space[i] == sed_cmd->string[j]) {
1106                                                         pattern_space[i] = sed_cmd->string[j + 1];
1107                                                         break;
1108                                                 }
1109                                         }
1110                                 }
1111
1112                                 break;
1113                         }
1114                         case 'g':       /* Replace pattern space with hold space */
1115                                 free(pattern_space);
1116                                 pattern_space = xstrdup(G.hold_space ? G.hold_space : "");
1117                                 break;
1118                         case 'G':       /* Append newline and hold space to pattern space */
1119                         {
1120                                 int pattern_space_size = 2;
1121                                 int hold_space_size = 0;
1122
1123                                 if (pattern_space)
1124                                         pattern_space_size += strlen(pattern_space);
1125                                 if (G.hold_space)
1126                                         hold_space_size = strlen(G.hold_space);
1127                                 pattern_space = xrealloc(pattern_space,
1128                                                 pattern_space_size + hold_space_size);
1129                                 if (pattern_space_size == 2)
1130                                         pattern_space[0] = 0;
1131                                 strcat(pattern_space, "\n");
1132                                 if (G.hold_space)
1133                                         strcat(pattern_space, G.hold_space);
1134                                 last_gets_char = '\n';
1135
1136                                 break;
1137                         }
1138                         case 'h':       /* Replace hold space with pattern space */
1139                                 free(G.hold_space);
1140                                 G.hold_space = xstrdup(pattern_space);
1141                                 break;
1142                         case 'H':       /* Append newline and pattern space to hold space */
1143                         {
1144                                 int hold_space_size = 2;
1145                                 int pattern_space_size = 0;
1146
1147                                 if (G.hold_space)
1148                                         hold_space_size += strlen(G.hold_space);
1149                                 if (pattern_space)
1150                                         pattern_space_size = strlen(pattern_space);
1151                                 G.hold_space = xrealloc(G.hold_space,
1152                                                 hold_space_size + pattern_space_size);
1153
1154                                 if (hold_space_size == 2)
1155                                         *G.hold_space = 0;
1156                                 strcat(G.hold_space, "\n");
1157                                 if (pattern_space)
1158                                         strcat(G.hold_space, pattern_space);
1159
1160                                 break;
1161                         }
1162                         case 'x': /* Exchange hold and pattern space */
1163                         {
1164                                 char *tmp = pattern_space;
1165                                 pattern_space = G.hold_space ? : xzalloc(1);
1166                                 last_gets_char = '\n';
1167                                 G.hold_space = tmp;
1168                                 break;
1169                         }
1170                         }
1171                 }
1172         }
1173
1174         /*
1175          * exit point from sedding...
1176          */
1177  discard_commands:
1178         /* we will print the line unless we were told to be quiet ('-n')
1179            or if the line was suppressed (ala 'd'elete) */
1180         if (!G.be_quiet)
1181                 sed_puts(pattern_space, last_gets_char);
1182
1183         /* Delete and such jump here. */
1184  discard_line:
1185         flush_append();
1186         free(pattern_space);
1187
1188         goto again;
1189 }
1190
1191 /* It is possible to have a command line argument with embedded
1192  * newlines.  This counts as multiple command lines.
1193  * However, newline can be escaped: 's/e/z\<newline>z/'
1194  * We check for this.
1195  */
1196
1197 static void add_cmd_block(char *cmdstr)
1198 {
1199         char *sv, *eol;
1200
1201         cmdstr = sv = xstrdup(cmdstr);
1202         do {
1203                 eol = strchr(cmdstr, '\n');
1204  next:
1205                 if (eol) {
1206                         /* Count preceding slashes */
1207                         int slashes = 0;
1208                         char *sl = eol;
1209
1210                         while (sl != cmdstr && *--sl == '\\')
1211                                 slashes++;
1212                         /* Odd number of preceding slashes - newline is escaped */
1213                         if (slashes & 1) {
1214                                 strcpy(eol-1, eol);
1215                                 eol = strchr(eol, '\n');
1216                                 goto next;
1217                         }
1218                         *eol = '\0';
1219                 }
1220                 add_cmd(cmdstr);
1221                 cmdstr = eol + 1;
1222         } while (eol);
1223         free(sv);
1224 }
1225
1226 int sed_main(int argc, char **argv);
1227 int sed_main(int argc, char **argv)
1228 {
1229         enum {
1230                 OPT_in_place = 1 << 0,
1231         };
1232         unsigned opt;
1233         llist_t *opt_e, *opt_f;
1234         int status = EXIT_SUCCESS;
1235
1236         INIT_G();
1237
1238         /* destroy command strings on exit */
1239         if (ENABLE_FEATURE_CLEAN_UP) atexit(sed_free_and_close_stuff);
1240
1241         /* Lie to autoconf when it starts asking stupid questions. */
1242         if (argc == 2 && !strcmp(argv[1], "--version")) {
1243                 puts("This is not GNU sed version 4.0");
1244                 return 0;
1245         }
1246
1247         /* do normal option parsing */
1248         opt_e = opt_f = NULL;
1249         opt_complementary = "e::f::" /* can occur multiple times */
1250                             "nn"; /* count -n */
1251         opt = getopt32(argv, "irne:f:", &opt_e, &opt_f,
1252                             &G.be_quiet); /* counter for -n */
1253         argc -= optind;
1254         argv += optind;
1255         if (opt & OPT_in_place) { // -i
1256                 atexit(cleanup_outname);
1257         }
1258         if (opt & 0x2) G.regex_type |= REG_EXTENDED; // -r
1259         //if (opt & 0x4) G.be_quiet++; // -n
1260         while (opt_e) { // -e
1261                 add_cmd_block(opt_e->data);
1262                 opt_e = opt_e->link;
1263                 /* we leak opt_e here... */
1264         }
1265         while (opt_f) { // -f
1266                 char *line;
1267                 FILE *cmdfile;
1268                 cmdfile = xfopen(opt_f->data, "r");
1269                 while ((line = xmalloc_getline(cmdfile)) != NULL) {
1270                         add_cmd(line);
1271                         free(line);
1272                 }
1273                 fclose(cmdfile);
1274                 opt_f = opt_f->link;
1275                 /* we leak opt_f here... */
1276         }
1277         /* if we didn't get a pattern from -e or -f, use argv[0] */
1278         if (!(opt & 0x18)) {
1279                 if (!argc)
1280                         bb_show_usage();
1281                 add_cmd_block(*argv++);
1282                 argc--;
1283         }
1284         /* Flush any unfinished commands. */
1285         add_cmd("");
1286
1287         /* By default, we write to stdout */
1288         G.nonstdout = stdout;
1289
1290         /* argv[0..(argc-1)] should be names of file to process. If no
1291          * files were specified or '-' was specified, take input from stdin.
1292          * Otherwise, we process all the files specified. */
1293         if (argv[0] == NULL) {
1294                 if (opt & OPT_in_place)
1295                         bb_error_msg_and_die(bb_msg_requires_arg, "-i");
1296                 add_input_file(stdin);
1297                 process_files();
1298         } else {
1299                 int i;
1300                 FILE *file;
1301
1302                 for (i = 0; i < argc; i++) {
1303                         struct stat statbuf;
1304                         int nonstdoutfd;
1305
1306                         if (LONE_DASH(argv[i]) && !(opt & OPT_in_place)) {
1307                                 add_input_file(stdin);
1308                                 process_files();
1309                                 continue;
1310                         }
1311                         file = fopen_or_warn(argv[i], "r");
1312                         if (!file) {
1313                                 status = EXIT_FAILURE;
1314                                 continue;
1315                         }
1316                         if (!(opt & OPT_in_place)) {
1317                                 add_input_file(file);
1318                                 continue;
1319                         }
1320
1321                         G.outname = xasprintf("%sXXXXXX", argv[i]);
1322                         nonstdoutfd = mkstemp(G.outname);
1323                         if (-1 == nonstdoutfd)
1324                                 bb_perror_msg_and_die("cannot create temp file %s", G.outname);
1325                         G.nonstdout = fdopen(nonstdoutfd, "w");
1326
1327                         /* Set permissions of output file */
1328
1329                         fstat(fileno(file), &statbuf);
1330                         fchmod(nonstdoutfd, statbuf.st_mode);
1331                         add_input_file(file);
1332                         process_files();
1333                         fclose(G.nonstdout);
1334
1335                         G.nonstdout = stdout;
1336                         /* unlink(argv[i]); */
1337                         // FIXME: error check / message?
1338                         rename(G.outname, argv[i]);
1339                         free(G.outname);
1340                         G.outname = 0;
1341                 }
1342                 if (G.input_file_count > G.current_input_file)
1343                         process_files();
1344         }
1345
1346         return status;
1347 }