1 /* Copyright (C) 2004-2018 Free Software Foundation, Inc.
2 Written by: Jeff Conrad (jeff_conrad@msn.com)
3 and Keith Marshall (keith.d.marshall@ntlworld.com)
5 This file is part of groff.
7 groff is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation, either version 3 of the License, or
10 (at your option) any later version.
12 groff is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 You should have received a copy of the GNU General Public License
18 along with this program. If not, see <http://www.gnu.org/licenses/>. */
26 /* Define the default mechanism, and messages, for error reporting
27 * (user may substitute a preferred alternative, by defining his own
28 * implementation of the macros REPORT_ERROR, QUOTE_ARG_MALLOC_FAILED
29 * and QUOTE_ARG_REALLOC_FAILED, in the header file 'nonposix.h').
35 # define REPORT_ERROR(WHY) fprintf(stderr, "%s:%s\n", program_name, WHY)
37 #ifndef QUOTE_ARG_MALLOC_ERROR
38 # define QUOTE_ARG_MALLOC_ERROR "malloc: Buffer allocation failed"
40 #ifndef QUOTE_ARG_REALLOC_ERROR
41 # define QUOTE_ARG_REALLOC_ERROR "realloc: Buffer resize failed"
44 extern char *program_name; /* main program must define this */
47 char *quote_arg(char *);
48 void purge_quoted_args(char **);
56 needs_quoting(const char *string)
58 /* Scan 'string' to see whether it needs quoting for MSVC 'spawn'/'exec'
59 * (i.e., whether it contains whitespace or embedded quotes).
62 if (string == NULL) /* ignore NULL strings */
65 if (*string == '\0') /* explicit arguments of zero length */
66 return TRUE; /* need quoting, so they aren't discarded */
69 /* Scan non-NULL strings, up to '\0' terminator,
70 * returning 'TRUE' if quote or white space found.
73 if (*string == '"' || isspace(*string))
76 /* otherwise, continue scanning to end of string */
81 /* Fall through, if no quotes or white space found,
82 * in which case, return 'FALSE'.
89 quote_arg(char *string)
91 /* Enclose arguments in double quotes so that the parsing done in the
92 * MSVC runtime startup code doesn't split them at whitespace. Escape
93 * embedded double quotes so that they emerge intact from the parsing.
99 if (needs_quoting(string)) {
100 /* Need to create a quoted copy of 'string';
101 * maximum buffer space needed is twice the original length,
102 * plus two enclosing quotes and one '\0' terminator.
105 if ((quoted = (char *)malloc(2 * strlen(string) + 3)) == NULL) {
106 /* Couldn't get a buffer for the quoted string,
107 * so complain, and bail out gracefully.
110 REPORT_ERROR(QUOTE_ARG_MALLOC_ERROR);
115 * insert the opening quote, then copy the source string,
116 * adding escapes as required.
120 for (backslashes = 0, p = string, q = quoted; *p; p++) {
122 /* Just count backslashes when we find them.
123 * We will copy them out later, when we know if the count
124 * needs to be adjusted, to escape an embedded quote.
129 else if (*p == '"') {
130 /* This embedded quote character must be escaped,
131 * but first double up any immediately preceding backslashes,
132 * with one extra, as the escape character.
135 for (backslashes += backslashes + 1; backslashes; backslashes--)
138 /* and now, add the quote character itself */
143 /* Any other character is simply copied,
144 * but first, if we have any pending backslashes,
145 * we must now insert them, without any count adjustment.
148 while (backslashes) {
153 /* and then, copy the current character */
159 /* At end of argument:
160 * If any backslashes remain to be copied out, append them now,
161 * doubling the actual count to protect against reduction by MSVC,
162 * as a consequence of the immediately following closing quote.
165 for (backslashes += backslashes; backslashes; backslashes--)
169 * add the closing quote, terminate the quoted string,
170 * and adjust its size to what was actually required,
176 if ((string = (char *)realloc(quoted, strlen(quoted) + 1)) == NULL) {
177 /* but bail out gracefully, on error */
179 REPORT_ERROR(QUOTE_ARG_REALLOC_ERROR);
184 /* 'string' now refers to the argument,
185 * quoted and escaped, as required.
192 purge_quoted_args(char **argv)
194 /* To avoid memory leaks,
195 * free all memory previously allocated by 'quoted_arg()',
196 * within the scope of the referring argument vector, 'argv'.
201 /* Any argument beginning with a double quote
202 * SHOULD have been allocated by 'quoted_arg()'.
206 free( *argv ); /* so free its allocation */
207 ++argv; /* and continue to the next argument */
211 /* quotearg.c: end of file */