1/* Create and destroy argument vectors (argv's) 2 Copyright (C) 1992, 2001 Free Software Foundation, Inc. 3 Written by Fred Fish @ Cygnus Support 4 5This file is part of the libiberty library. 6Libiberty is free software; you can redistribute it and/or 7modify it under the terms of the GNU Library General Public 8License as published by the Free Software Foundation; either 9version 2 of the License, or (at your option) any later version. 10 11Libiberty is distributed in the hope that it will be useful, 12but WITHOUT ANY WARRANTY; without even the implied warranty of 13MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14Library General Public License for more details. 15 16You should have received a copy of the GNU Library General Public 17License along with libiberty; see the file COPYING.LIB. If 18not, write to the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor, 19Boston, MA 02110-1301, USA. */ 20 21 22/* Create and destroy argument vectors. An argument vector is simply an 23 array of string pointers, terminated by a NULL pointer. */ 24 25#ifdef HAVE_CONFIG_H 26#include "config.h" 27#endif 28#include "ansidecl.h" 29#include "libiberty.h" 30#include "safe-ctype.h" 31 32/* Routines imported from standard C runtime libraries. */ 33 34#include <stddef.h> 35#include <string.h> 36#include <stdlib.h> 37#include <stdio.h> 38 39#ifndef NULL 40#define NULL 0 41#endif 42 43#ifndef EOS 44#define EOS '\0' 45#endif 46 47#define INITIAL_MAXARGC 8 /* Number of args + NULL in initial argv */ 48 49 50/* 51 52@deftypefn Extension char** dupargv (char **@var{vector}) 53 54Duplicate an argument vector. Simply scans through @var{vector}, 55duplicating each argument until the terminating @code{NULL} is found. 56Returns a pointer to the argument vector if successful. Returns 57@code{NULL} if there is insufficient memory to complete building the 58argument vector. 59 60@end deftypefn 61 62*/ 63 64char ** 65dupargv (char **argv) 66{ 67 int argc; 68 char **copy; 69 70 if (argv == NULL) 71 return NULL; 72 73 /* the vector */ 74 for (argc = 0; argv[argc] != NULL; argc++); 75 copy = (char **) malloc ((argc + 1) * sizeof (char *)); 76 if (copy == NULL) 77 return NULL; 78 79 /* the strings */ 80 for (argc = 0; argv[argc] != NULL; argc++) 81 { 82 int len = strlen (argv[argc]); 83 copy[argc] = (char *) malloc (len + 1); 84 if (copy[argc] == NULL) 85 { 86 freeargv (copy); 87 return NULL; 88 } 89 strcpy (copy[argc], argv[argc]); 90 } 91 copy[argc] = NULL; 92 return copy; 93} 94 95/* 96 97@deftypefn Extension void freeargv (char **@var{vector}) 98 99Free an argument vector that was built using @code{buildargv}. Simply 100scans through @var{vector}, freeing the memory for each argument until 101the terminating @code{NULL} is found, and then frees @var{vector} 102itself. 103 104@end deftypefn 105 106*/ 107 108void freeargv (char **vector) 109{ 110 register char **scan; 111 112 if (vector != NULL) 113 { 114 for (scan = vector; *scan != NULL; scan++) 115 { 116 free (*scan); 117 } 118 free (vector); 119 } 120} 121 122/* 123 124@deftypefn Extension char** buildargv (char *@var{sp}) 125 126Given a pointer to a string, parse the string extracting fields 127separated by whitespace and optionally enclosed within either single 128or double quotes (which are stripped off), and build a vector of 129pointers to copies of the string for each field. The input string 130remains unchanged. The last element of the vector is followed by a 131@code{NULL} element. 132 133All of the memory for the pointer array and copies of the string 134is obtained from @code{malloc}. All of the memory can be returned to the 135system with the single function call @code{freeargv}, which takes the 136returned result of @code{buildargv}, as it's argument. 137 138Returns a pointer to the argument vector if successful. Returns 139@code{NULL} if @var{sp} is @code{NULL} or if there is insufficient 140memory to complete building the argument vector. 141 142If the input is a null string (as opposed to a @code{NULL} pointer), 143then buildarg returns an argument vector that has one arg, a null 144string. 145 146@end deftypefn 147 148The memory for the argv array is dynamically expanded as necessary. 149 150In order to provide a working buffer for extracting arguments into, 151with appropriate stripping of quotes and translation of backslash 152sequences, we allocate a working buffer at least as long as the input 153string. This ensures that we always have enough space in which to 154work, since the extracted arg is never larger than the input string. 155 156The argument vector is always kept terminated with a @code{NULL} arg 157pointer, so it can be passed to @code{freeargv} at any time, or 158returned, as appropriate. 159 160*/ 161 162char **buildargv (const char *input) 163{ 164 char *arg; 165 char *copybuf; 166 int squote = 0; 167 int dquote = 0; 168 int bsquote = 0; 169 int argc = 0; 170 int maxargc = 0; 171 char **argv = NULL; 172 char **nargv; 173 174 if (input != NULL) 175 { 176 copybuf = (char *) alloca (strlen (input) + 1); 177 /* Is a do{}while to always execute the loop once. Always return an 178 argv, even for null strings. See NOTES above, test case below. */ 179 do 180 { 181 /* Pick off argv[argc] */ 182 while (ISBLANK (*input)) 183 { 184 input++; 185 } 186 if ((maxargc == 0) || (argc >= (maxargc - 1))) 187 { 188 /* argv needs initialization, or expansion */ 189 if (argv == NULL) 190 { 191 maxargc = INITIAL_MAXARGC; 192 nargv = (char **) malloc (maxargc * sizeof (char *)); 193 } 194 else 195 { 196 maxargc *= 2; 197 nargv = (char **) realloc (argv, maxargc * sizeof (char *)); 198 } 199 if (nargv == NULL) 200 { 201 if (argv != NULL) 202 { 203 freeargv (argv); 204 argv = NULL; 205 } 206 break; 207 } 208 argv = nargv; 209 argv[argc] = NULL; 210 } 211 /* Begin scanning arg */ 212 arg = copybuf; 213 while (*input != EOS) 214 { 215 if (ISSPACE (*input) && !squote && !dquote && !bsquote) 216 { 217 break; 218 } 219 else 220 { 221 if (bsquote) 222 { 223 bsquote = 0; 224 *arg++ = *input; 225 } 226 else if (*input == '\\') 227 { 228 bsquote = 1; 229 } 230 else if (squote) 231 { 232 if (*input == '\'') 233 { 234 squote = 0; 235 } 236 else 237 { 238 *arg++ = *input; 239 } 240 } 241 else if (dquote) 242 { 243 if (*input == '"') 244 { 245 dquote = 0; 246 } 247 else 248 { 249 *arg++ = *input; 250 } 251 } 252 else 253 { 254 if (*input == '\'') 255 { 256 squote = 1; 257 } 258 else if (*input == '"') 259 { 260 dquote = 1; 261 } 262 else 263 { 264 *arg++ = *input; 265 } 266 } 267 input++; 268 } 269 } 270 *arg = EOS; 271 argv[argc] = strdup (copybuf); 272 if (argv[argc] == NULL) 273 { 274 freeargv (argv); 275 argv = NULL; 276 break; 277 } 278 argc++; 279 argv[argc] = NULL; 280 281 while (ISSPACE (*input)) 282 { 283 input++; 284 } 285 } 286 while (*input != EOS); 287 } 288 return (argv); 289} 290 291/* 292 293@deftypefn Extension void expandargv (int *@var{argcp}, char ***@var{argvp}) 294 295The @var{argcp} and @code{argvp} arguments are pointers to the usual 296@code{argc} and @code{argv} arguments to @code{main}. This function 297looks for arguments that begin with the character @samp{@@}. Any such 298arguments are interpreted as ``response files''. The contents of the 299response file are interpreted as additional command line options. In 300particular, the file is separated into whitespace-separated strings; 301each such string is taken as a command-line option. The new options 302are inserted in place of the option naming the response file, and 303@code{*argcp} and @code{*argvp} will be updated. If the value of 304@code{*argvp} is modified by this function, then the new value has 305been dynamically allocated and can be deallocated by the caller with 306@code{freeargv}. However, most callers will simply call 307@code{expandargv} near the beginning of @code{main} and allow the 308operating system to free the memory when the program exits. 309 310@end deftypefn 311 312*/ 313 314void 315expandargv (argcp, argvp) 316 int *argcp; 317 char ***argvp; 318{ 319 /* The argument we are currently processing. */ 320 int i = 0; 321 /* Non-zero if ***argvp has been dynamically allocated. */ 322 int argv_dynamic = 0; 323 /* Loop over the arguments, handling response files. We always skip 324 ARGVP[0], as that is the name of the program being run. */ 325 while (++i < *argcp) 326 { 327 /* The name of the response file. */ 328 const char *filename; 329 /* The response file. */ 330 FILE *f; 331 /* An upper bound on the number of characters in the response 332 file. */ 333 long pos; 334 /* The number of characters in the response file, when actually 335 read. */ 336 size_t len; 337 /* A dynamically allocated buffer used to hold options read from a 338 response file. */ 339 char *buffer; 340 /* Dynamically allocated storage for the options read from the 341 response file. */ 342 char **file_argv; 343 /* The number of options read from the response file, if any. */ 344 size_t file_argc; 345 /* We are only interested in options of the form "@file". */ 346 filename = (*argvp)[i]; 347 if (filename[0] != '@') 348 continue; 349 /* Read the contents of the file. */ 350 f = fopen (++filename, "r"); 351 if (!f) 352 continue; 353 if (fseek (f, 0L, SEEK_END) == -1) 354 goto error; 355 pos = ftell (f); 356 if (pos == -1) 357 goto error; 358 if (fseek (f, 0L, SEEK_SET) == -1) 359 goto error; 360 buffer = (char *) xmalloc (pos * sizeof (char) + 1); 361 len = fread (buffer, sizeof (char), pos, f); 362 if (len != (size_t) pos 363 /* On Windows, fread may return a value smaller than POS, 364 due to CR/LF->CR translation when reading text files. 365 That does not in-and-of itself indicate failure. */ 366 && ferror (f)) 367 goto error; 368 /* Add a NUL terminator. */ 369 buffer[len] = '\0'; 370 /* Parse the string. */ 371 file_argv = buildargv (buffer); 372 /* If *ARGVP is not already dynamically allocated, copy it. */ 373 if (!argv_dynamic) 374 { 375 *argvp = dupargv (*argvp); 376 if (!*argvp) 377 { 378 fputs ("\nout of memory\n", stderr); 379 xexit (1); 380 } 381 } 382 /* Count the number of arguments. */ 383 file_argc = 0; 384 while (file_argv[file_argc] && *file_argv[file_argc]) 385 ++file_argc; 386 /* Now, insert FILE_ARGV into ARGV. The "+1" below handles the 387 NULL terminator at the end of ARGV. */ 388 *argvp = ((char **) 389 xrealloc (*argvp, 390 (*argcp + file_argc + 1) * sizeof (char *))); 391 memmove (*argvp + i + file_argc, *argvp + i + 1, 392 (*argcp - i) * sizeof (char *)); 393 memcpy (*argvp + i, file_argv, file_argc * sizeof (char *)); 394 /* The original option has been replaced by all the new 395 options. */ 396 *argcp += file_argc - 1; 397 /* Free up memory allocated to process the response file. We do 398 not use freeargv because the individual options in FILE_ARGV 399 are now in the main ARGV. */ 400 free (file_argv); 401 free (buffer); 402 /* Rescan all of the arguments just read to support response 403 files that include other response files. */ 404 --i; 405 error: 406 /* We're all done with the file now. */ 407 fclose (f); 408 } 409} 410 411#ifdef MAIN 412 413/* Simple little test driver. */ 414 415static const char *const tests[] = 416{ 417 "a simple command line", 418 "arg 'foo' is single quoted", 419 "arg \"bar\" is double quoted", 420 "arg \"foo bar\" has embedded whitespace", 421 "arg 'Jack said \\'hi\\'' has single quotes", 422 "arg 'Jack said \\\"hi\\\"' has double quotes", 423 "a b c d e f g h i j k l m n o p q r s t u v w x y z 1 2 3 4 5 6 7 8 9", 424 425 /* This should be expanded into only one argument. */ 426 "trailing-whitespace ", 427 428 "", 429 NULL 430}; 431 432int 433main (void) 434{ 435 char **argv; 436 const char *const *test; 437 char **targs; 438 439 for (test = tests; *test != NULL; test++) 440 { 441 printf ("buildargv(\"%s\")\n", *test); 442 if ((argv = buildargv (*test)) == NULL) 443 { 444 printf ("failed!\n\n"); 445 } 446 else 447 { 448 for (targs = argv; *targs != NULL; targs++) 449 { 450 printf ("\t\"%s\"\n", *targs); 451 } 452 printf ("\n"); 453 } 454 freeargv (argv); 455 } 456 457 return 0; 458} 459 460#endif /* MAIN */ 461