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- /*
- * Copyright (c) 1989 Stichting Mathematisch Centrum, Amsterdam, Netherlands.
- * Written by Guido van Rossum (guido@cwi.nl).
- * NO WARRANTIES!
- * Freely usable and copyable as long as this copyright message remains intact.
- */
-
- /*
- * Function glob() as proposed in Posix 1003.2 B.6 (rev. 9).
- * Matches *, ? and [] in pathnames like sh(1).
- * The [!...] convention to negate a range is supported (SysV, Posix, ksh).
- * The interface is a superset of the one defined in Posix 1003.2 (draft 9).
- * Optional extra services, controlled by flags not defined by Posix:
- * - replace initial ~username by username's home dir (~ by $HOME);
- * - replace initial $var(but not $var elsewhere) by value of getenv("var");
- * - escaping convention: \ inhibits any special meaning the following
- * character might have (except \ at end of string is kept);
- * - harmonica matching: /foo/** matches all files in the tree under /foo,
- * including /foo itself.
- * If you don't want code for $ or ~ or ** expansion, simply remove the
- * corresponding #defines from glob.h.
- */
-
- #include <ctype.h>
- #include <errno.h>
- #include <string.h>
- #include <sys/types.h>
- #include <dirent.h>
- #ifdef SYSV
- #define MAXPATHLEN 1024
- #else
- #include <sys/param.h> /* For MAXPATHLEN */
- #endif
- #include <sys/stat.h>
- #include <stdio.h>
- #include <assert.h>
- #include <glob.h>
-
- extern struct passwd *getpwnam();
- extern char *malloc();
- extern char *realloc();
- extern char *getenv();
- extern int errno;
-
- #ifndef NULL
- #define NULL 0
- #endif
-
- #ifndef STATIC
- #define STATIC static
- #endif
-
- typedef int bool_t;
- #define FALSE 0
- #define TRUE 1
-
- #define TILDE '~'
- #define DOLLAR '$'
- #define UNDERSCORE '_'
- #define QUOTE '\\'
-
- #define SEP '/'
- #define DOT '.'
-
- #define STAR '*'
- #define QUESTION '?'
- #define LBRACKET '['
- #define RBRACKET ']'
- #define NOT '!'
- #define RANGE '-'
-
- #define EOS '\0'
-
- #define HOME "HOME"
-
- #define MARK 0x80
- #define META(c) ((c)|MARK)
- #define M_ALL META('*')
- #define M_ONE META('?')
- #define M_SET META('[')
- #define M_NOT META('!')
- #define M_RNG META('-')
- #define M_END META(']')
- #define ISMETA(c) (((c)&MARK) != 0)
-
-
- #if GLOB_TILDE | GLOB_DOLLAR
-
- /* Copy the characters between str and strend to buf, and append a
- trailing zero. Assumes buf is MAXPATHLEN+1 long. Returns buf. */
-
- STATIC char *
- makestr(buf, str, strend)
- char *buf; /* Size MAXPATHLEN+1 */
- char *str, *strend;
- {
- int n;
-
- n = strend - str;
- if (n > MAXPATHLEN)
- n = MAXPATHLEN;
- strncpy(buf, str, n);
- buf[n] = EOS;
- return buf;
- }
-
- /* Append string to buffer, return new end of buffer. Guarded. */
-
- STATIC char *
- addstr(dest, src, end)
- char *dest;
- char *src;
- char *end;
- {
- while (*dest++ = *src++) {
- if (dest >= end)
- break;
- }
- return --dest;
- }
-
- #endif /* GLOB_TILDE | GLOB_DOLLAR */
-
-
- #if GLOB_TILDE
-
- #include <pwd.h>
-
- /* Find a user's home directory, NULL if not found */
-
- STATIC char *
- gethome(username)
- char *username;
- {
- struct passwd *p;
-
- p = getpwnam(username);
- if (p == NULL)
- return NULL;
- else
- return p->pw_dir;
- }
-
- #endif /* GLOB_TILDE */
-
-
- /* String compare for qsort */
-
- STATIC int
- compare(p, q)
- char **p;
- char **q;
- {
- return strcmp(*p, *q);
- }
-
-
- /* The main glob() routine: does optional $ and ~ substitution,
- compiles the pattern (optionally processing quotes),
- calls glob1() to do the real pattern matching,
- and finally sorts the list (unless unsorted operation is requested).
- Returns 0 if things went well, nonzero if errors occurred.
- It is not an error to find no matches. */
-
- int
- glob(pattern, flags, errfunc, pglob)
- char *pattern;
- int flags;
- int (*errfunc)();
- glob_t *pglob;
- {
- char *patnext = pattern;
- char patbuf[MAXPATHLEN+1];
- char *bufnext, *bufend;
- char *compilebuf, *compilepat;
- char *p, *q;
- char c;
- int err;
- int oldpathc;
-
- if ((flags & GLOB_APPEND) == 0) {
- pglob->gl_pathc = 0;
- pglob->gl_pathv = NULL;
- if ((flags & GLOB_DOOFFS) == 0)
- pglob->gl_offs = 0;
- }
- pglob->gl_flags = flags;
- pglob->gl_errfunc = errfunc;
- oldpathc = pglob->gl_pathc;
-
- bufnext = patbuf;
- bufend = bufnext+MAXPATHLEN;
-
- #if GLOB_DOLLAR | GLOB_TILDE
- c = *patnext;
- #endif
-
- #if GLOB_DOLLAR
- if (c == DOLLAR && (flags & GLOB_DOLLAR)) {
- p = ++patnext;
- while (isalnum(*p) || *p == UNDERSCORE)
- ++p;
- if ((q = getenv(makestr(bufnext, patnext, p))) != NULL)
- bufnext = addstr(bufnext, q, bufend);
- patnext = p;
- }
- #endif /* GLOB_DOLLAR */
-
- #if GLOB_TILDE
- if (c == TILDE && (flags & GLOB_TILDE)) {
- p = ++patnext;
- while (*p != EOS && *p != SEP)
- ++p;
- if (p == patnext) {
- q = getenv(HOME);
- if (q == NULL)
- --patnext;
- else
- bufnext = addstr(bufnext, q, bufend);
- }
- else {
- q = gethome(makestr(bufnext, patnext, p));
- if (q == NULL)
- --patnext;
- else {
- bufnext = addstr(bufnext, q, bufend);
- patnext = p;
- }
- }
- }
- #endif /* GLOB_DOLLAR */
-
- compilebuf = bufnext;
- compilepat = patnext;
- while (bufnext < bufend && (c = *patnext++) != EOS) {
- switch (c) {
-
- case QUOTE:
- if (!(flags & GLOB_QUOTE))
- *bufnext++ = QUOTE;
- else {
- if ((c = *patnext++) == EOS) {
- c = QUOTE;
- --patnext;
- }
- *bufnext++ = c;
- }
- break;
-
- case STAR:
- *bufnext++ = M_ALL;
- break;
-
- case QUESTION:
- *bufnext++ = M_ONE;
- break;
-
- case LBRACKET:
- c = *patnext;
- if (c == NOT)
- ++patnext;
- if (*patnext == EOS ||
- strchr(patnext+1, RBRACKET) == NULL) {
- *bufnext++ = LBRACKET;
- if (c == NOT)
- --patnext;
- break;
- }
- *bufnext++ = M_SET;
- if (c == NOT)
- *bufnext++ = M_NOT;
- c = *patnext++;
- do {
- /* TO DO: quoting */
- *bufnext++ = c;
- if (*patnext == RANGE &&
- (c = patnext[1]) != RBRACKET) {
- *bufnext++ = M_RNG;
- *bufnext++ = c;
- patnext += 2;
- }
- } while ((c = *patnext++) != RBRACKET);
- *bufnext++ = M_END;
- break;
-
- default:
- *bufnext++ = c;
- break;
-
- }
- }
- *bufnext = EOS;
-
- if ((err = glob1(patbuf, pglob)) != 0)
- return err;
-
- if (pglob->gl_pathc == oldpathc) {
- if (flags & GLOB_NOCHECK) {
- if (!(flags & GLOB_QUOTE))
- strcpy(compilebuf, compilepat);
- else {
- /* Copy pattern, interpreting quotes */
- /* This is slightly different than the
- interpretation of quotes above --
- which should prevail??? */
- while (*compilepat != EOS) {
- if (*compilepat == QUOTE) {
- if (*++compilepat == EOS)
- --compilepat;
- }
- *compilebuf++ = *compilepat++;
- }
- *compilebuf = EOS;
- }
- return globextend(patbuf, pglob);
- }
- }
- else {
- if (!(flags & GLOB_NOSORT))
- qsort((char*)
- (pglob->gl_pathv + pglob->gl_offs + oldpathc),
- pglob->gl_pathc - oldpathc,
- sizeof(char*), compare);
- }
-
- return 0;
- }
-
- STATIC int
- glob1(pattern, pglob)
- char *pattern;
- glob_t *pglob;
- {
- char pathbuf[MAXPATHLEN+1];
-
- /* A null pathname is invalid (Posix 1003.1 sec. 2.4 last sentence) */
- if (*pattern == EOS)
- return 0;
- return glob2(pathbuf, pathbuf, pattern, pglob);
- }
-
- /* Functions glob2 and glob3 are mutually recursive; there is one level
- of recursion for each segment in the pattern that contains one or
- more meta characters. */
-
- STATIC int
- glob2(pathbuf, pathend, pattern, pglob)
- char *pathbuf; /*[MAXPATHLEN+1]*/
- char *pathend;
- char *pattern;
- glob_t *pglob;
- {
- bool_t anymeta = FALSE;
- char *p, *q;
-
- /* Loop over pattern segments until end of pattern or until
- segment with meta character found. */
- for (;;) {
- /* End of pattern? */
- if (*pattern == EOS) {
- struct stat sbuf;
- *pathend = EOS;
- if (stat(pathbuf, &sbuf) != 0)
- return 0; /* Need error call here? */
- if ((pglob->gl_flags & GLOB_MARK) &&
- pathend[-1] != SEP &&
- (sbuf.st_mode & S_IFMT) == S_IFDIR) {
- *pathend++ = SEP;
- *pathend = EOS;
- }
- return globextend(pathbuf, pglob);
- }
-
- /* Find end of next segment, copy tentatively to pathend */
- q = pathend;
- p = pattern;
- while (*p != EOS && *p != SEP) {
- if (ISMETA(*p))
- anymeta = TRUE;
- *q++ = *p++;
- }
-
- if (!anymeta) {
- /* No expansion needed, go on with next segment */
- pathend = q;
- pattern = p;
- while (*pattern == SEP)
- *pathend++ = *pattern++;
- }
- else {
- /* Need expansion, start another recursion level */
- #ifdef GLOB_HARMONICA
- if ((pglob->gl_flags & GLOB_HARMONICA) &&
- isharmonica(pattern, p)) {
- /* Special case: foo|**|bar matches foo|bar */
- int err = glob2a(pathbuf, pathend, p, pglob);
- if (err != 0)
- return err;
- }
- #endif /* GLOB_HARMONICA */
- return glob3(pathbuf, pathend, pattern, p, pglob);
- }
- }
- /* We never get here */
- }
-
- #ifdef GLOB_HARMONICA
-
- STATIC int
- glob2a(pathbuf, pathend, restpattern, pglob)
- char *pathbuf; /*[MAXPATHLEN+1]*/
- char *pathend;
- char *restpattern;
- glob_t *pglob;
- {
- /* Various special cases to get foo|**|bar right.
- Table (| substituted for / to avoid ending the comment!):
-
- pathbuf: restpattern:
- ** (1) **| (2) **|bar (3)
- (A) foo/ foo foo/ foo/bar
- (B) / / / /bar
- (C) empty none none bar
-
- In case (2), any number of tailing slashes might be present:
- **|||||||.
-
- Note that, because of the way glob2() and glob3() work,
- if pathbuf is not empty, it ends in a slash.
- Similarly, we know that restpattern[0] is either a slash
- or the end of the string.
- */
-
- int err;
-
- if (pathend > pathbuf) { /* Cases (A) and (B) */
- if (restpattern[0] == SEP) /* Cases (2) and (3) */
- restpattern++;
- else if (pathend >= pathbuf+2) /* Case (A)(1) */
- pathend--; /* <--- Ouch! */
- /* Else, case (B)(1), nothing changes */
- }
- else { /* Case (C) */
- while (restpattern[0] == SEP)
- restpattern++;
- if (*restpattern == EOS) /* Cases (1) or (2) -- don't match */
- return 0;
- }
-
- err = glob2(pathbuf, pathend, restpattern, pglob);
- *pathend = SEP; /* Restore slash removed by line 'Ouch!' above */
- return err;
- }
-
- #endif /* GLOB_HARMONICA */
-
- STATIC int
- glob3(pathbuf, pathend, pattern, restpattern, pglob)
- char *pathbuf; /*[MAXPATHLEN+1]*/
- char *pathend;
- char *pattern, *restpattern;
- glob_t *pglob;
- {
- DIR *dirp;
- struct dirent *dp;
- int len;
- int err;
- #ifdef GLOB_HARMONICA
- int harmonica = (pglob->gl_flags & GLOB_HARMONICA) &&
- isharmonica(pattern, restpattern);
- #endif /* GLOB_HARMONICA */
-
- *pathend = EOS;
- errno = 0;
- if ((dirp = opendir(*pathbuf ? pathbuf : ".")) == NULL) {
- /* TO DO: don't call for ENOENT or ENOTDIR */
- if (pglob->gl_errfunc != NULL &&
- (*pglob->gl_errfunc)(pathbuf, errno) != 0 ||
- (pglob->gl_flags & GLOB_ERR))
- return GLOB_ABEND;
- else
- return 0;
- }
-
- err = 0;
-
- /* Search directory for matching names */
- while ((dp = readdir(dirp)) != NULL) {
- if (dp->d_name[0] == DOT && *pattern != DOT)
- continue; /* Initial DOT must be matched literally */
- if (
- #ifdef GLOB_HARMONICA
- !harmonica &&
- #endif
- !match(dp->d_name, pattern, restpattern))
- continue; /* No match */
- len = strlen(dp->d_name);
- strcpy(pathend, dp->d_name);
- err = glob2(pathbuf, pathend+len, restpattern, pglob);
- if (err != 0)
- break;
- #ifdef GLOB_HARMONICA
- if (harmonica) {
- pathend[len] = EOS;
- if (isdir(pathbuf)) {
- pathend[len++] = SEP;
- pathend[len] = EOS;
- err = glob3(pathbuf, pathend+len,
- pattern, restpattern, pglob);
- if (err != 0)
- break;
- }
- }
- #endif /* GLOB_HARMONICA */
- }
- /* TO DO: check error from readdir? */
-
- closedir(dirp);
- return err;
- }
-
-
- #ifdef GLOB_HARMONICA
-
- /* Test for harmonica pattern (a pattern consisting of exactly two stars) */
-
- STATIC bool_t
- isharmonica(pat, patend)
- char *pat, *patend;
- {
- return (pat[0] & 0xff) == M_ALL && (pat[1] & 0xff) == M_ALL &&
- pat+2 == patend;
- }
-
- /* Test for directory -- use lstat() to avoid endless recursion */
-
- STATIC bool_t
- isdir(path)
- char *path;
- {
- struct stat sbuf;
-
- if (lstat(path, &sbuf) < 0)
- return FALSE;
- return (sbuf.st_mode & S_IFMT) == S_IFDIR;
- }
-
- #endif /* GLOB_HARMONICA */
-
-
- /* Extend the gl_pathv member of a glob_t structure to accomodate
- a new item, add the new item, and update gl_pathc.
-
- *** This assumes the BSD realloc, which only copies the block
- when its size crosses a power-of-two boundary; for v7 realloc,
- this would cause quadratic behavior. ***
-
- Return 0 if new item added, error code if memory couldn't be allocated.
-
- Invariant of the glob_t structure:
-
- Either gl_pathc is zero and gl_pathv is NULL; or
- gl_pathc > 0 and gl_pathv points to (gl_offs + gl_pathc + 1) items.
- */
-
- STATIC int
- globextend(path, pglob)
- char *path;
- glob_t *pglob;
- {
- register char **pathv;
- register int i;
- unsigned int newsize;
- unsigned int copysize;
- char *copy;
-
- newsize = sizeof(*pathv) * (2 + pglob->gl_pathc + pglob->gl_offs);
- if ((pathv = pglob->gl_pathv) == NULL)
- pathv = (char **)malloc(newsize);
- else
- pathv = (char **)realloc((char *)pathv, newsize);
- if (pathv == NULL)
- return GLOB_NOSPACE;
-
- if (pglob->gl_pathv == NULL && pglob->gl_offs > 0) {
- /* First time around -- clear initial gl_offs items */
- pathv += pglob->gl_offs;
- for (i = pglob->gl_offs; --i >= 0; )
- *--pathv = NULL;
- }
- pglob->gl_pathv = pathv;
-
- copysize = strlen(path) + 1;
- if ((copy = malloc(copysize)) != NULL) {
- strcpy(copy, path);
- pathv[pglob->gl_offs + pglob->gl_pathc++] = copy;
- }
- pathv[pglob->gl_offs + pglob->gl_pathc] = NULL;
-
- return (copy == NULL) ? GLOB_NOSPACE : 0;
- }
-
-
- /* Pattern matching function for filenames.
- Each occurrence of the * pattern causes a recursion level. */
-
- STATIC bool_t
- match(name, pat, patend)
- register char *name;
- register char *pat, *patend;
- {
- char c;
-
- while (pat < patend) {
- c = *pat++;
- switch (c & 0xff) {
-
- case M_ONE:
- if (*name++ == EOS)
- return FALSE;
- break;
-
- case M_ALL:
- if (pat == patend)
- return TRUE;
- for (; *name != EOS; ++name) {
- if (match(name, pat, patend))
- return TRUE;
- }
- return FALSE;
-
- case M_SET:
- {
- char k;
- bool_t ok;
- bool_t negate_range;
-
- ok = FALSE;
- k = *name++;
- if (negate_range = (*pat & 0xff) == M_NOT)
- ++pat;
- while (((c = *pat++) & 0xff) != M_END) {
- if ((*pat & 0xff) == M_RNG) {
- if (c <= k && k <= pat[1])
- ok = TRUE;
- pat += 2;
- }
- else if (c == k)
- ok = TRUE;
- }
- if (ok == negate_range)
- return FALSE;
- break;
- }
-
- default:
- if (*name++ != c)
- return FALSE;
- break;
-
- }
- }
- return *name == EOS;
- }
-
-
- /* Free allocated data belonging to a glob_t structure.
- This is part of the Posix interface. */
-
- void
- globfree(pglob)
- glob_t *pglob;
- {
- if (pglob->gl_pathv != NULL) {
- char **pp = pglob->gl_pathv + pglob->gl_offs;
- int i;
- for (i = 0; i < pglob->gl_pathc; ++i) {
- if (*pp != NULL)
- free(*pp);
- }
- free((char *)pp);
- }
- }
-