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Diffstat (limited to 'common/w32-misc.c')
| -rw-r--r-- | common/w32-misc.c | 192 |
1 files changed, 192 insertions, 0 deletions
diff --git a/common/w32-misc.c b/common/w32-misc.c new file mode 100644 index 000000000..8aef12e4a --- /dev/null +++ b/common/w32-misc.c @@ -0,0 +1,192 @@ +/* w32-misc.c - Helper functions needed in Windows + * Copyright (C) 2021 g10 Code GmbH + * + * This file is part of GnuPG. + * + * This file is free software; you can redistribute it and/or modify + * it under the terms of either + * + * - the GNU Lesser General Public License as published by the Free + * Software Foundation; either version 3 of the License, or (at + * your option) any later version. + * + * or + * + * - the GNU General Public License as published by the Free + * Software Foundation; either version 2 of the License, or (at + * your option) any later version. + * + * or both in parallel, as here. + * + * This file 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 General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, see <https://www.gnu.org/licenses/>. + */ + +#include <config.h> + +#include "util.h" +#include "w32help.h" + + +/* Return the number of backslashes. */ +static unsigned int +count_backslashes (const char *s) +{ + unsigned int count = 0; + + for ( ;*s == '\\'; s++) + count++; + return count; +} + + +static void +strip_one_arg (char *string) +{ + char *s, *d; + unsigned int n, i; + + for (s=d=string; *s; s++) + if (*s == '\\') + { + n = count_backslashes (s); + if (s[n] == '"') + { + for (i=0; i < n/2; i++) + *d++ = '\\'; + if ((n&1)) /* Odd number of backslashes. */ + *d++ = '"'; /* Print the quote. */ + } + else /* Print all backslashes. */ + { + for (i=0; i < n; i++) + *d++ = '\\'; + n--; /* Adjust for the increment in the for. */ + } + s += n; + } + else if (*s == '"' && s[1]) + *d++ = *++s; + else + *d++ = *s; + *d = 0; +} + + +/* Helper for parse_w32_commandline. */ +static int +parse_cmdstring (char *string, char **argv) +{ + int argc = 0; + int inquote = 0; + char *p0, *p; + unsigned int n; + + p0 = string; + for (p=string; *p; p++) + { + if (inquote) + { + if (*p == '\\' && p[1] == '"') + p++; + else if (*p == '"') + { + if (argv && (p[1] == ' ' || p[1] == '\t' || !p[1])) + *p = 0; + inquote = 0; + } + } + else if (*p == '\\' && (n=count_backslashes (p))) + { + if (!p0) /* First non-WS; set start. */ + p0 = p; + if (p[n] == '"') + { + if (!(n&1)) /* Even number. */ + inquote = 1; + p++; + } + p += n; + } + else if (*p == '"') + { + inquote = 1; + if (!p0 || p == string) /* First non-WS or first char; set start. */ + p0 = p + 1; + } + else if (*p == ' ' || *p == '\t') + { + if (p0) /* We are in an argument and reached WS. */ + { + if (argv) + { + *p = 0; + strip_one_arg (p0); + argv[argc] = p0; + } + argc++; + p0 = NULL; + } + } + else if (!p0) /* First non-WS; set start. */ + p0 = p; + } + + if (inquote || p0) + { + /* Closing quote missing (we accept this as argument anyway) or + * an open argument. */ + if (argv) + { + *p = 0; + strip_one_arg (p0); + argv[argc] = p0; + } + argc++; + } + + return argc; +} + +/* This is a Windows command line parser, returning an array with + * strings and its count. The argument CMDLINE is expected to be + * utf-8 encoded and may be modified after returning from this + * function. The returned array points into CMDLINE, so this should + * not be freed. If GLOBING is set to true globing is done for all + * items. Returns NULL on error. The number of items in the array is + * returned at R_ARGC. */ +char ** +w32_parse_commandline (char *cmdline, int globing, int *r_argc) +{ + int argc, i; + char **argv; + + (void)globing; + + argc = parse_cmdstring (cmdline, NULL); + if (!argc) + { + log_error ("%s failed: %s\n", __func__, "internal error"); + return NULL; /* Ooops. */ + } + argv = xtrycalloc (argc+1, sizeof *argv); + if (!argv) + { + log_error ("%s failed: %s\n", __func__, strerror (errno)); + return NULL; /* Ooops. */ + } + i = parse_cmdstring (cmdline, argv); + if (argc != i) + { + log_error ("%s failed (argc=%d i=%d)\n", __func__, argc, i); + xfree (argv); + return NULL; /* Ooops. */ + } + *r_argc = argc; + return argv; +} |