1 /* printf - format and print data
2 Copyright (C) 90, 91, 92, 93, 94, 1995 Free Software Foundation, Inc.
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2, or (at your option)
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software
16 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
18 /* Usage: printf format [argument...]
20 A front end to the printf function that lets it be used from the shell.
28 \c = produce no further output
34 \0ooo = octal number (ooo is 0 to 3 digits)
35 \xhhh = hexadecimal number (hhh is 1 to 3 digits)
39 %b = print an argument string, interpreting backslash escapes
41 The `format' argument is re-used as many times as necessary
42 to convert all of the given arguments.
44 David MacKenzie <djm@gnu.ai.mit.edu> */
48 #include <sys/types.h>
53 #include "long-options.h"
59 unsigned long strtoul ();
62 #define isodigit(c) ((c) >= '0' && (c) <= '7')
63 #define hextobin(c) ((c)>='a'&&(c)<='f' ? (c)-'a'+10 : (c)>='A'&&(c)<='F' ? (c)-'A'+10 : (c)-'0')
64 #define octtobin(c) ((c) - '0')
68 static double xstrtod __P ((char *s));
69 static int print_esc __P ((char *escstart));
70 static int print_formatted __P ((char *format, int argc, char **argv));
71 static long xstrtol __P ((char *s));
72 static unsigned long xstrtoul __P ((char *s));
73 static void print_direc __P ((char *start, size_t length, int field_width, int precision, char *argument));
74 static void print_esc_char __P ((int c));
75 static void print_esc_string __P ((char *str));
76 static void verify __P ((char *s, char *end));
78 /* The value to return to the calling program. */
79 static int exit_status;
81 /* The name this program was run with. */
88 fprintf (stderr, _("Try `%s --help' for more information.\n"),
93 Usage: %s FORMAT [ARGUMENT]...\n\
96 program_name, program_name);
98 Print ARGUMENT(s) according to FORMAT.\n\
100 --help display this help and exit\n\
101 --version output version information and exit\n\
103 FORMAT controls the output as in C printf. Interpreted sequences are:\n\
106 \\0NNN character with octal value NNN (0 to 3 digits)\n\
110 \\c produce no further output\n\
113 \\r carriage return\n\
114 \\t horizontal tab\n\
116 \\xNNN character with hexadecimal value NNN (1 to 3 digits)\n\
119 %%b ARGUMENT as a string with `\\' escapes interpreted\n\
121 and all C format specifications ending with one of diouxXfeEgGcs, with\n\
122 ARGUMENTs converted to proper type first. Variable widths are handled.\n\
129 main (int argc, char **argv)
134 program_name = argv[0];
137 parse_long_options (argc, argv, "printf", version_string, usage);
141 fprintf (stderr, _("Usage: %s format [argument...]\n"), program_name);
151 args_used = print_formatted (format, argc, argv);
155 while (args_used > 0 && argc > 0);
160 /* Print the text in FORMAT, using ARGV (with ARGC elements) for
161 arguments to any `%' directives.
162 Return the number of elements of ARGV used. */
165 print_formatted (char *format, int argc, char **argv)
167 int save_argc = argc; /* Preserve original value. */
168 char *f; /* Pointer into `format'. */
169 char *direc_start; /* Start of % directive. */
170 size_t direc_length; /* Length of % directive. */
171 int field_width; /* Arg to first '*', or -1 if none. */
172 int precision; /* Arg to second '*', or -1 if none. */
174 for (f = format; *f; ++f)
181 field_width = precision = -1;
191 print_esc_string (*argv);
197 if (strchr ("-+ #", *f))
208 field_width = xstrtoul (*argv);
231 precision = xstrtoul (*argv);
245 if (*f == 'l' || *f == 'L' || *f == 'h')
250 if (!strchr ("diouxXfeEgGcs", *f))
251 error (1, 0, _("%%%c: invalid directive"), *f);
255 print_direc (direc_start, direc_length, field_width,
261 print_direc (direc_start, direc_length, field_width,
274 return save_argc - argc;
277 /* Print a \ escape sequence starting at ESCSTART.
278 Return the number of characters in the escape sequence
279 besides the backslash. */
282 print_esc (char *escstart)
284 register char *p = escstart + 1;
285 int esc_value = 0; /* Value of \nnn escape. */
286 int esc_length; /* Length of \nnn escape. */
288 /* \0ooo and \xhhh escapes have maximum length of 3 chars. */
291 for (esc_length = 0, ++p;
292 esc_length < 3 && ISXDIGIT (*p);
294 esc_value = esc_value * 16 + hextobin (*p);
296 error (1, 0, _("missing hexadecimal number in escape"));
301 for (esc_length = 0, ++p;
302 esc_length < 3 && isodigit (*p);
304 esc_value = esc_value * 8 + octtobin (*p);
307 else if (strchr ("\"\\abcfnrtv", *p))
308 print_esc_char (*p++);
310 error (1, 0, _("\\%c: invalid escape"), *p);
311 return p - escstart - 1;
314 /* Output a single-character \ escape. */
317 print_esc_char (int c)
321 case 'a': /* Alert. */
324 case 'b': /* Backspace. */
327 case 'c': /* Cancel the rest of the output. */
330 case 'f': /* Form feed. */
333 case 'n': /* New line. */
336 case 'r': /* Carriage return. */
339 case 't': /* Horizontal tab. */
342 case 'v': /* Vertical tab. */
351 /* Print string STR, evaluating \ escapes. */
354 print_esc_string (char *str)
358 str += print_esc (str);
363 /* Output a % directive. START is the start of the directive,
364 LENGTH is its length, and ARGUMENT is its argument.
365 If FIELD_WIDTH or PRECISION is non-negative, they are args for
366 '*' values in those fields. */
369 print_direc (char *start, size_t length, int field_width, int precision, char *argument)
371 char *p; /* Null-terminated copy of % directive. */
373 p = xmalloc ((unsigned) (length + 1));
374 strncpy (p, start, length);
377 switch (p[length - 1])
384 printf (p, xstrtol (argument));
386 printf (p, precision, xstrtol (argument));
391 printf (p, field_width, xstrtol (argument));
393 printf (p, field_width, precision, xstrtol (argument));
404 printf (p, xstrtoul (argument));
406 printf (p, precision, xstrtoul (argument));
411 printf (p, field_width, xstrtoul (argument));
413 printf (p, field_width, precision, xstrtoul (argument));
425 printf (p, xstrtod (argument));
427 printf (p, precision, xstrtod (argument));
432 printf (p, field_width, xstrtod (argument));
434 printf (p, field_width, precision, xstrtod (argument));
439 printf (p, *argument);
446 printf (p, argument);
448 printf (p, precision, argument);
453 printf (p, field_width, argument);
455 printf (p, field_width, precision, argument);
470 val = strtoul (s, &end, 0);
482 val = strtol (s, &end, 0);
494 val = strtod (s, &end);
500 verify (char *s, char *end)
504 error (0, errno, "%s", s);
510 error (0, 0, _("%s: expected a numeric value"), s);
512 error (0, 0, _("%s: value not completely converted"), s);