1 /* $OpenBSD: glob.c,v 1.26 2005/11/28 17:50:12 deraadt Exp $ */
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35 * _wapi_glob(3) -- a subset of the one defined in POSIX 1003.2.
37 * Optional extra services, controlled by flags not defined by POSIX:
40 * Set in gl_flags if pattern contained a globbing character.
42 #include <sys/param.h>
55 #include "wapi_glob.h"
65 #define M_QUOTE 0x8000
66 #define M_PROTECT 0x4000
68 #define M_ASCII 0x00ff
75 #define M_PROTECT 0x40
84 #define CHAR(c) ((gchar)((c)&M_ASCII))
85 #define META(c) ((gchar)((c)|M_QUOTE))
86 #define M_ALL META('*')
87 #define M_ONE META('?')
88 #define ismeta(c) (((c)&M_QUOTE) != 0)
91 static int g_Ctoc(const gchar *, char *, u_int);
92 static int glob0(GDir *dir, const gchar *, wapi_glob_t *, gboolean);
93 static int glob1(GDir *dir, gchar *, gchar *, wapi_glob_t *, size_t *, gboolean);
94 static int glob3(GDir *dir, gchar *, gchar *, wapi_glob_t *, size_t *, gboolean);
95 static int globextend(const gchar *, wapi_glob_t *, size_t *);
96 static int match(const gchar *, gchar *, gchar *, gboolean);
98 static void qprintf(const char *, Char *);
102 _wapi_glob(GDir *dir, const char *pattern, int flags, wapi_glob_t *pglob)
104 const u_char *patnext;
106 gchar *bufnext, *bufend, patbuf[MAXPATHLEN];
108 patnext = (u_char *) pattern;
110 pglob->gl_pathv = NULL;
112 pglob->gl_flags = flags & ~WAPI_GLOB_MAGCHAR;
115 bufend = bufnext + MAXPATHLEN - 1;
117 /* Protect the quoted characters. */
118 while (bufnext < bufend && (c = *patnext++) != EOS)
120 if ((c = *patnext++) == EOS) {
124 *bufnext++ = c | M_PROTECT;
130 return glob0(dir, patbuf, pglob, flags & WAPI_GLOB_IGNORECASE);
134 * The main glob() routine: compiles the pattern (optionally processing
135 * quotes), calls glob1() to do the real pattern matching, and finally
136 * sorts the list (unless unsorted operation is requested). Returns 0
137 * if things went well, nonzero if errors occurred. It is not an error
138 * to find no matches.
141 glob0(GDir *dir, const gchar *pattern, wapi_glob_t *pglob, gboolean ignorecase)
143 const gchar *qpatnext;
144 int c, err, oldpathc;
145 gchar *bufnext, patbuf[MAXPATHLEN];
149 oldpathc = pglob->gl_pathc;
152 /* We don't need to check for buffer overflow any more. */
153 while ((c = *qpatnext++) != EOS) {
156 pglob->gl_flags |= WAPI_GLOB_MAGCHAR;
160 pglob->gl_flags |= WAPI_GLOB_MAGCHAR;
161 /* collapse adjacent stars to one,
162 * to avoid exponential behavior
164 if (bufnext == patbuf || bufnext[-1] != M_ALL)
168 *bufnext++ = CHAR(c);
174 qprintf("glob0:", patbuf);
177 if ((err = glob1(dir, patbuf, patbuf+MAXPATHLEN-1, pglob, &limit,
181 if (pglob->gl_pathc == oldpathc) {
182 return(WAPI_GLOB_NOMATCH);
189 glob1(GDir *dir, gchar *pattern, gchar *pattern_last, wapi_glob_t *pglob,
190 size_t *limitp, gboolean ignorecase)
192 /* A null pathname is invalid -- POSIX 1003.1 sect. 2.4. */
195 return(glob3(dir, pattern, pattern_last, pglob, limitp, ignorecase));
199 glob3(GDir *dir, gchar *pattern, gchar *pattern_last, wapi_glob_t *pglob,
200 size_t *limitp, gboolean ignorecase)
204 /* Search directory for matching names. */
205 while ((name = g_dir_read_name(dir))) {
206 if (!match(name, pattern, pattern + strlen (pattern),
210 globextend (name, pglob, limitp);
218 * Extend the gl_pathv member of a wapi_glob_t structure to accommodate a new item,
219 * add the new item, and update gl_pathc.
221 * This assumes the BSD realloc, which only copies the block when its size
222 * crosses a power-of-two boundary; for v7 realloc, this would cause quadratic
225 * Return 0 if new item added, error code if memory couldn't be allocated.
227 * Invariant of the wapi_glob_t structure:
228 * Either gl_pathc is zero and gl_pathv is NULL; or gl_pathc > 0 and
229 * gl_pathv points to (gl_offs + gl_pathc + 1) items.
232 globextend(const gchar *path, wapi_glob_t *pglob, size_t *limitp)
240 newsize = sizeof(*pathv) * (2 + pglob->gl_pathc + pglob->gl_offs);
241 pathv = pglob->gl_pathv ? realloc((char *)pglob->gl_pathv, newsize) :
244 if (pglob->gl_pathv) {
245 free(pglob->gl_pathv);
246 pglob->gl_pathv = NULL;
248 return(WAPI_GLOB_NOSPACE);
251 if (pglob->gl_pathv == NULL && pglob->gl_offs > 0) {
252 /* first time around -- clear initial gl_offs items */
253 pathv += pglob->gl_offs;
254 for (i = pglob->gl_offs; --i >= 0; )
257 pglob->gl_pathv = pathv;
259 for (p = path; *p++;)
261 len = (size_t)(p - path);
263 if ((copy = malloc(len)) != NULL) {
264 if (g_Ctoc(path, copy, len)) {
266 return(WAPI_GLOB_NOSPACE);
268 pathv[pglob->gl_offs + pglob->gl_pathc++] = copy;
270 pathv[pglob->gl_offs + pglob->gl_pathc] = NULL;
272 if ((pglob->gl_flags & WAPI_GLOB_LIMIT) &&
273 newsize + *limitp >= ARG_MAX) {
275 return(WAPI_GLOB_NOSPACE);
278 return(copy == NULL ? WAPI_GLOB_NOSPACE : 0);
283 * pattern matching function for filenames. Each occurrence of the *
284 * pattern causes a recursion level.
287 match(const gchar *name, gchar *pat, gchar *patend, gboolean ignorecase)
291 while (pat < patend) {
293 switch (c & M_MASK) {
298 if (match(name, pat, patend, ignorecase))
300 } while (*name++ != EOS);
308 if (g_ascii_tolower (*name++) != g_ascii_tolower (c))
318 return(*name == EOS);
321 /* Free allocated data belonging to a wapi_glob_t structure. */
323 _wapi_globfree(wapi_glob_t *pglob)
328 if (pglob->gl_pathv != NULL) {
329 pp = pglob->gl_pathv + pglob->gl_offs;
330 for (i = pglob->gl_pathc; i--; ++pp)
333 free(pglob->gl_pathv);
334 pglob->gl_pathv = NULL;
339 g_Ctoc(const gchar *str, char *buf, u_int len)
343 if ((*buf++ = *str++) == EOS)
351 qprintf(const char *str, Char *s)
355 (void)printf("%s:\n", str);
357 (void)printf("%c", CHAR(*p));
360 (void)printf("%c", *p & M_PROTECT ? '"' : ' ');
363 (void)printf("%c", ismeta(*p) ? '_' : ' ');