From 554fd8c5195424bdbcabf5de30fdc183aba391bd Mon Sep 17 00:00:00 2001 From: upstream source tree Date: Sun, 15 Mar 2015 20:14:05 -0400 Subject: obtained gcc-4.6.4.tar.bz2 from upstream website; verified gcc-4.6.4.tar.bz2.sig; imported gcc-4.6.4 source tree from verified upstream tarball. downloading a git-generated archive based on the 'upstream' tag should provide you with a source tree that is binary identical to the one extracted from the above tarball. if you have obtained the source via the command 'git clone', however, do note that line-endings of files in your working directory might differ from line-endings of the respective files in the upstream repository. --- libiberty/argv.c | 544 +++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 544 insertions(+) create mode 100644 libiberty/argv.c (limited to 'libiberty/argv.c') diff --git a/libiberty/argv.c b/libiberty/argv.c new file mode 100644 index 000000000..8476c8fda --- /dev/null +++ b/libiberty/argv.c @@ -0,0 +1,544 @@ +/* Create and destroy argument vectors (argv's) + Copyright (C) 1992, 2001, 2010 Free Software Foundation, Inc. + Written by Fred Fish @ Cygnus Support + +This file is part of the libiberty library. +Libiberty is free software; you can redistribute it and/or +modify it under the terms of the GNU Library General Public +License as published by the Free Software Foundation; either +version 2 of the License, or (at your option) any later version. + +Libiberty is distributed in the hope that it will be useful, +but WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +Library General Public License for more details. + +You should have received a copy of the GNU Library General Public +License along with libiberty; see the file COPYING.LIB. If +not, write to the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor, +Boston, MA 02110-1301, USA. */ + + +/* Create and destroy argument vectors. An argument vector is simply an + array of string pointers, terminated by a NULL pointer. */ + +#ifdef HAVE_CONFIG_H +#include "config.h" +#endif +#include "ansidecl.h" +#include "libiberty.h" +#include "safe-ctype.h" + +/* Routines imported from standard C runtime libraries. */ + +#include +#include +#include +#include + +#ifndef NULL +#define NULL 0 +#endif + +#ifndef EOS +#define EOS '\0' +#endif + +#define INITIAL_MAXARGC 8 /* Number of args + NULL in initial argv */ + + +/* + +@deftypefn Extension char** dupargv (char **@var{vector}) + +Duplicate an argument vector. Simply scans through @var{vector}, +duplicating each argument until the terminating @code{NULL} is found. +Returns a pointer to the argument vector if successful. Returns +@code{NULL} if there is insufficient memory to complete building the +argument vector. + +@end deftypefn + +*/ + +char ** +dupargv (char **argv) +{ + int argc; + char **copy; + + if (argv == NULL) + return NULL; + + /* the vector */ + for (argc = 0; argv[argc] != NULL; argc++); + copy = (char **) malloc ((argc + 1) * sizeof (char *)); + if (copy == NULL) + return NULL; + + /* the strings */ + for (argc = 0; argv[argc] != NULL; argc++) + { + int len = strlen (argv[argc]); + copy[argc] = (char *) malloc (len + 1); + if (copy[argc] == NULL) + { + freeargv (copy); + return NULL; + } + strcpy (copy[argc], argv[argc]); + } + copy[argc] = NULL; + return copy; +} + +/* + +@deftypefn Extension void freeargv (char **@var{vector}) + +Free an argument vector that was built using @code{buildargv}. Simply +scans through @var{vector}, freeing the memory for each argument until +the terminating @code{NULL} is found, and then frees @var{vector} +itself. + +@end deftypefn + +*/ + +void freeargv (char **vector) +{ + register char **scan; + + if (vector != NULL) + { + for (scan = vector; *scan != NULL; scan++) + { + free (*scan); + } + free (vector); + } +} + +static void +consume_whitespace (const char **input) +{ + while (ISSPACE (**input)) + { + (*input)++; + } +} + +static int +only_whitespace (const char* input) +{ + while (*input != EOS && ISSPACE (*input)) + input++; + + return (*input == EOS); +} + +/* + +@deftypefn Extension char** buildargv (char *@var{sp}) + +Given a pointer to a string, parse the string extracting fields +separated by whitespace and optionally enclosed within either single +or double quotes (which are stripped off), and build a vector of +pointers to copies of the string for each field. The input string +remains unchanged. The last element of the vector is followed by a +@code{NULL} element. + +All of the memory for the pointer array and copies of the string +is obtained from @code{malloc}. All of the memory can be returned to the +system with the single function call @code{freeargv}, which takes the +returned result of @code{buildargv}, as it's argument. + +Returns a pointer to the argument vector if successful. Returns +@code{NULL} if @var{sp} is @code{NULL} or if there is insufficient +memory to complete building the argument vector. + +If the input is a null string (as opposed to a @code{NULL} pointer), +then buildarg returns an argument vector that has one arg, a null +string. + +@end deftypefn + +The memory for the argv array is dynamically expanded as necessary. + +In order to provide a working buffer for extracting arguments into, +with appropriate stripping of quotes and translation of backslash +sequences, we allocate a working buffer at least as long as the input +string. This ensures that we always have enough space in which to +work, since the extracted arg is never larger than the input string. + +The argument vector is always kept terminated with a @code{NULL} arg +pointer, so it can be passed to @code{freeargv} at any time, or +returned, as appropriate. + +*/ + +char **buildargv (const char *input) +{ + char *arg; + char *copybuf; + int squote = 0; + int dquote = 0; + int bsquote = 0; + int argc = 0; + int maxargc = 0; + char **argv = NULL; + char **nargv; + + if (input != NULL) + { + copybuf = (char *) alloca (strlen (input) + 1); + /* Is a do{}while to always execute the loop once. Always return an + argv, even for null strings. See NOTES above, test case below. */ + do + { + /* Pick off argv[argc] */ + consume_whitespace (&input); + + if ((maxargc == 0) || (argc >= (maxargc - 1))) + { + /* argv needs initialization, or expansion */ + if (argv == NULL) + { + maxargc = INITIAL_MAXARGC; + nargv = (char **) malloc (maxargc * sizeof (char *)); + } + else + { + maxargc *= 2; + nargv = (char **) realloc (argv, maxargc * sizeof (char *)); + } + if (nargv == NULL) + { + if (argv != NULL) + { + freeargv (argv); + argv = NULL; + } + break; + } + argv = nargv; + argv[argc] = NULL; + } + /* Begin scanning arg */ + arg = copybuf; + while (*input != EOS) + { + if (ISSPACE (*input) && !squote && !dquote && !bsquote) + { + break; + } + else + { + if (bsquote) + { + bsquote = 0; + *arg++ = *input; + } + else if (*input == '\\') + { + bsquote = 1; + } + else if (squote) + { + if (*input == '\'') + { + squote = 0; + } + else + { + *arg++ = *input; + } + } + else if (dquote) + { + if (*input == '"') + { + dquote = 0; + } + else + { + *arg++ = *input; + } + } + else + { + if (*input == '\'') + { + squote = 1; + } + else if (*input == '"') + { + dquote = 1; + } + else + { + *arg++ = *input; + } + } + input++; + } + } + *arg = EOS; + argv[argc] = strdup (copybuf); + if (argv[argc] == NULL) + { + freeargv (argv); + argv = NULL; + break; + } + argc++; + argv[argc] = NULL; + + consume_whitespace (&input); + } + while (*input != EOS); + } + return (argv); +} + +/* + +@deftypefn Extension int writeargv (const char **@var{argv}, FILE *@var{file}) + +Write each member of ARGV, handling all necessary quoting, to the file +named by FILE, separated by whitespace. Return 0 on success, non-zero +if an error occurred while writing to FILE. + +@end deftypefn + +*/ + +int +writeargv (char **argv, FILE *f) +{ + int status = 0; + + if (f == NULL) + return 1; + + while (*argv != NULL) + { + const char *arg = *argv; + + while (*arg != EOS) + { + char c = *arg; + + if (ISSPACE(c) || c == '\\' || c == '\'' || c == '"') + if (EOF == fputc ('\\', f)) + { + status = 1; + goto done; + } + + if (EOF == fputc (c, f)) + { + status = 1; + goto done; + } + arg++; + } + + if (EOF == fputc ('\n', f)) + { + status = 1; + goto done; + } + argv++; + } + + done: + return status; +} + +/* + +@deftypefn Extension void expandargv (int *@var{argcp}, char ***@var{argvp}) + +The @var{argcp} and @code{argvp} arguments are pointers to the usual +@code{argc} and @code{argv} arguments to @code{main}. This function +looks for arguments that begin with the character @samp{@@}. Any such +arguments are interpreted as ``response files''. The contents of the +response file are interpreted as additional command line options. In +particular, the file is separated into whitespace-separated strings; +each such string is taken as a command-line option. The new options +are inserted in place of the option naming the response file, and +@code{*argcp} and @code{*argvp} will be updated. If the value of +@code{*argvp} is modified by this function, then the new value has +been dynamically allocated and can be deallocated by the caller with +@code{freeargv}. However, most callers will simply call +@code{expandargv} near the beginning of @code{main} and allow the +operating system to free the memory when the program exits. + +@end deftypefn + +*/ + +void +expandargv (int *argcp, char ***argvp) +{ + /* The argument we are currently processing. */ + int i = 0; + /* Non-zero if ***argvp has been dynamically allocated. */ + int argv_dynamic = 0; + /* Limit the number of response files that we parse in order + to prevent infinite recursion. */ + unsigned int iteration_limit = 2000; + /* Loop over the arguments, handling response files. We always skip + ARGVP[0], as that is the name of the program being run. */ + while (++i < *argcp) + { + /* The name of the response file. */ + const char *filename; + /* The response file. */ + FILE *f; + /* An upper bound on the number of characters in the response + file. */ + long pos; + /* The number of characters in the response file, when actually + read. */ + size_t len; + /* A dynamically allocated buffer used to hold options read from a + response file. */ + char *buffer; + /* Dynamically allocated storage for the options read from the + response file. */ + char **file_argv; + /* The number of options read from the response file, if any. */ + size_t file_argc; + /* We are only interested in options of the form "@file". */ + filename = (*argvp)[i]; + if (filename[0] != '@') + continue; + /* If we have iterated too many times then stop. */ + if (-- iteration_limit == 0) + { + fprintf (stderr, "%s: error: too many @-files encountered\n", (*argvp)[0]); + xexit (1); + } + /* Read the contents of the file. */ + f = fopen (++filename, "r"); + if (!f) + continue; + if (fseek (f, 0L, SEEK_END) == -1) + goto error; + pos = ftell (f); + if (pos == -1) + goto error; + if (fseek (f, 0L, SEEK_SET) == -1) + goto error; + buffer = (char *) xmalloc (pos * sizeof (char) + 1); + len = fread (buffer, sizeof (char), pos, f); + if (len != (size_t) pos + /* On Windows, fread may return a value smaller than POS, + due to CR/LF->CR translation when reading text files. + That does not in-and-of itself indicate failure. */ + && ferror (f)) + goto error; + /* Add a NUL terminator. */ + buffer[len] = '\0'; + /* If the file is empty or contains only whitespace, buildargv would + return a single empty argument. In this context we want no arguments, + instead. */ + if (only_whitespace (buffer)) + { + file_argv = (char **) xmalloc (sizeof (char *)); + file_argv[0] = NULL; + } + else + /* Parse the string. */ + file_argv = buildargv (buffer); + /* If *ARGVP is not already dynamically allocated, copy it. */ + if (!argv_dynamic) + { + *argvp = dupargv (*argvp); + if (!*argvp) + { + fputs ("\nout of memory\n", stderr); + xexit (1); + } + } + /* Count the number of arguments. */ + file_argc = 0; + while (file_argv[file_argc]) + ++file_argc; + /* Now, insert FILE_ARGV into ARGV. The "+1" below handles the + NULL terminator at the end of ARGV. */ + *argvp = ((char **) + xrealloc (*argvp, + (*argcp + file_argc + 1) * sizeof (char *))); + memmove (*argvp + i + file_argc, *argvp + i + 1, + (*argcp - i) * sizeof (char *)); + memcpy (*argvp + i, file_argv, file_argc * sizeof (char *)); + /* The original option has been replaced by all the new + options. */ + *argcp += file_argc - 1; + /* Free up memory allocated to process the response file. We do + not use freeargv because the individual options in FILE_ARGV + are now in the main ARGV. */ + free (file_argv); + free (buffer); + /* Rescan all of the arguments just read to support response + files that include other response files. */ + --i; + error: + /* We're all done with the file now. */ + fclose (f); + } +} + +#ifdef MAIN + +/* Simple little test driver. */ + +static const char *const tests[] = +{ + "a simple command line", + "arg 'foo' is single quoted", + "arg \"bar\" is double quoted", + "arg \"foo bar\" has embedded whitespace", + "arg 'Jack said \\'hi\\'' has single quotes", + "arg 'Jack said \\\"hi\\\"' has double quotes", + "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", + + /* This should be expanded into only one argument. */ + "trailing-whitespace ", + + "", + NULL +}; + +int +main (void) +{ + char **argv; + const char *const *test; + char **targs; + + for (test = tests; *test != NULL; test++) + { + printf ("buildargv(\"%s\")\n", *test); + if ((argv = buildargv (*test)) == NULL) + { + printf ("failed!\n\n"); + } + else + { + for (targs = argv; *targs != NULL; targs++) + { + printf ("\t\"%s\"\n", *targs); + } + printf ("\n"); + } + freeargv (argv); + } + + return 0; +} + +#endif /* MAIN */ -- cgit v1.2.3