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/types.h>
54 #include "wapi_glob.h"
64 #define M_QUOTE 0x8000
65 #define M_PROTECT 0x4000
67 #define M_ASCII 0x00ff
69 typedef unsigned short Char;
74 #define M_PROTECT 0x40
83 #define CHAR(c) ((gchar)((c)&M_ASCII))
84 #define META(c) ((gchar)((c)|M_QUOTE))
85 #define M_ALL META('*')
86 #define M_ONE META('?')
87 #define ismeta(c) (((c)&M_QUOTE) != 0)
90 static int g_Ctoc(const gchar *, char *, unsigned int);
91 static int glob0(GDir *dir, const gchar *, wapi_glob_t *, gboolean,
93 static int glob1(GDir *dir, gchar *, gchar *, wapi_glob_t *, size_t *,
95 static int glob3(GDir *dir, gchar *, gchar *, wapi_glob_t *, size_t *,
97 static int globextend(const gchar *, wapi_glob_t *, size_t *);
98 static int match(const gchar *, gchar *, gchar *, gboolean);
100 static void qprintf(const char *, Char *);
104 _wapi_glob(GDir *dir, const char *pattern, int flags, wapi_glob_t *pglob)
106 const unsigned char *patnext;
108 gchar *bufnext, *bufend, patbuf[PATH_MAX];
110 patnext = (unsigned char *) pattern;
111 if (!(flags & WAPI_GLOB_APPEND)) {
113 pglob->gl_pathv = NULL;
116 pglob->gl_flags = flags & ~WAPI_GLOB_MAGCHAR;
119 bufend = bufnext + PATH_MAX - 1;
121 /* Protect the quoted characters. */
122 while (bufnext < bufend && (c = *patnext++) != EOS)
124 if ((c = *patnext++) == EOS) {
128 *bufnext++ = c | M_PROTECT;
134 return glob0(dir, patbuf, pglob, flags & WAPI_GLOB_IGNORECASE,
135 flags & WAPI_GLOB_UNIQUE);
139 * The main glob() routine: compiles the pattern (optionally processing
140 * quotes), calls glob1() to do the real pattern matching, and finally
141 * sorts the list (unless unsorted operation is requested). Returns 0
142 * if things went well, nonzero if errors occurred. It is not an error
143 * to find no matches.
146 glob0(GDir *dir, const gchar *pattern, wapi_glob_t *pglob, gboolean ignorecase,
149 const gchar *qpatnext;
150 int c, err, oldpathc;
151 gchar *bufnext, patbuf[PATH_MAX];
155 oldpathc = pglob->gl_pathc;
158 /* We don't need to check for buffer overflow any more. */
159 while ((c = *qpatnext++) != EOS) {
162 pglob->gl_flags |= WAPI_GLOB_MAGCHAR;
166 pglob->gl_flags |= WAPI_GLOB_MAGCHAR;
167 /* collapse adjacent stars to one,
168 * to avoid exponential behavior
170 if (bufnext == patbuf || bufnext[-1] != M_ALL)
174 *bufnext++ = CHAR(c);
180 qprintf("glob0:", patbuf);
183 if ((err = glob1(dir, patbuf, patbuf+PATH_MAX-1, pglob, &limit,
184 ignorecase, unique)) != 0)
187 if (pglob->gl_pathc == oldpathc) {
188 return(WAPI_GLOB_NOMATCH);
195 glob1(GDir *dir, gchar *pattern, gchar *pattern_last, wapi_glob_t *pglob,
196 size_t *limitp, gboolean ignorecase, gboolean unique)
198 /* A null pathname is invalid -- POSIX 1003.1 sect. 2.4. */
201 return(glob3(dir, pattern, pattern_last, pglob, limitp, ignorecase,
205 static gboolean contains (wapi_glob_t *pglob, const gchar *name)
210 if (pglob->gl_pathv != NULL) {
211 pp = pglob->gl_pathv + pglob->gl_offs;
212 for (i = pglob->gl_pathc; i--; ++pp) {
214 if (!strcmp (*pp, name)) {
225 glob3(GDir *dir, gchar *pattern, gchar *pattern_last, wapi_glob_t *pglob,
226 size_t *limitp, gboolean ignorecase, gboolean unique)
230 /* Search directory for matching names. */
231 while ((name = g_dir_read_name(dir))) {
232 if (!match(name, pattern, pattern + strlen (pattern),
237 !contains (pglob, name)) {
238 globextend (name, pglob, limitp);
247 * Extend the gl_pathv member of a wapi_glob_t structure to accommodate a new item,
248 * add the new item, and update gl_pathc.
250 * This assumes the BSD realloc, which only copies the block when its size
251 * crosses a power-of-two boundary; for v7 realloc, this would cause quadratic
254 * Return 0 if new item added, error code if memory couldn't be allocated.
256 * Invariant of the wapi_glob_t structure:
257 * Either gl_pathc is zero and gl_pathv is NULL; or gl_pathc > 0 and
258 * gl_pathv points to (gl_offs + gl_pathc + 1) items.
261 globextend(const gchar *path, wapi_glob_t *pglob, size_t *limitp)
265 unsigned int newsize, len;
269 newsize = sizeof(*pathv) * (2 + pglob->gl_pathc + pglob->gl_offs);
270 pathv = pglob->gl_pathv ? realloc((char *)pglob->gl_pathv, newsize) :
273 if (pglob->gl_pathv) {
274 free(pglob->gl_pathv);
275 pglob->gl_pathv = NULL;
277 return(WAPI_GLOB_NOSPACE);
280 if (pglob->gl_pathv == NULL && pglob->gl_offs > 0) {
281 /* first time around -- clear initial gl_offs items */
282 pathv += pglob->gl_offs;
283 for (i = pglob->gl_offs; --i >= 0; )
286 pglob->gl_pathv = pathv;
288 for (p = path; *p++;)
290 len = (size_t)(p - path);
292 if ((copy = malloc(len)) != NULL) {
293 if (g_Ctoc(path, copy, len)) {
295 return(WAPI_GLOB_NOSPACE);
297 pathv[pglob->gl_offs + pglob->gl_pathc++] = copy;
299 pathv[pglob->gl_offs + pglob->gl_pathc] = NULL;
302 /* Broken on opensuse 11 */
303 if ((pglob->gl_flags & WAPI_GLOB_LIMIT) &&
304 newsize + *limitp >= ARG_MAX) {
306 return(WAPI_GLOB_NOSPACE);
310 return(copy == NULL ? WAPI_GLOB_NOSPACE : 0);
315 * pattern matching function for filenames. Each occurrence of the *
316 * pattern causes a recursion level.
319 match(const gchar *name, gchar *pat, gchar *patend, gboolean ignorecase)
323 while (pat < patend) {
325 switch (c & M_MASK) {
330 if (match(name, pat, patend, ignorecase))
332 } while (*name++ != EOS);
340 if (g_ascii_tolower (*name++) != g_ascii_tolower (c))
350 return(*name == EOS);
353 /* Free allocated data belonging to a wapi_glob_t structure. */
355 _wapi_globfree(wapi_glob_t *pglob)
360 if (pglob->gl_pathv != NULL) {
361 pp = pglob->gl_pathv + pglob->gl_offs;
362 for (i = pglob->gl_pathc; i--; ++pp)
365 free(pglob->gl_pathv);
366 pglob->gl_pathv = NULL;
371 g_Ctoc(const gchar *str, char *buf, unsigned int len)
375 if ((*buf++ = *str++) == EOS)
383 qprintf(const char *str, Char *s)
387 (void)printf("%s:\n", str);
389 (void)printf("%c", CHAR(*p));
392 (void)printf("%c", *p & M_PROTECT ? '"' : ' ');
395 (void)printf("%c", ismeta(*p) ? '_' : ' ');