diff options
Diffstat (limited to 'dir.c')
| -rw-r--r-- | dir.c | 401 |
1 files changed, 401 insertions, 0 deletions
@@ -0,0 +1,401 @@ +/* + * This handles recursive filename detection with exclude + * files, index knowledge etc.. + * + * Copyright (C) Linus Torvalds, 2005-2006 + * Junio Hamano, 2005-2006 + */ +#include <dirent.h> +#include <fnmatch.h> + +#include "cache.h" +#include "dir.h" + +int common_prefix(const char **pathspec) +{ + const char *path, *slash, *next; + int prefix; + + if (!pathspec) + return 0; + + path = *pathspec; + slash = strrchr(path, '/'); + if (!slash) + return 0; + + prefix = slash - path + 1; + while ((next = *++pathspec) != NULL) { + int len = strlen(next); + if (len >= prefix && !memcmp(path, next, len)) + continue; + for (;;) { + if (!len) + return 0; + if (next[--len] != '/') + continue; + if (memcmp(path, next, len+1)) + continue; + prefix = len + 1; + break; + } + } + return prefix; +} + +static int match_one(const char *match, const char *name, int namelen) +{ + int matchlen; + + /* If the match was just the prefix, we matched */ + matchlen = strlen(match); + if (!matchlen) + return 1; + + /* + * If we don't match the matchstring exactly, + * we need to match by fnmatch + */ + if (strncmp(match, name, matchlen)) + return !fnmatch(match, name, 0); + + /* + * If we did match the string exactly, we still + * need to make sure that it happened on a path + * component boundary (ie either the last character + * of the match was '/', or the next character of + * the name was '/' or the terminating NUL. + */ + return match[matchlen-1] == '/' || + name[matchlen] == '/' || + !name[matchlen]; +} + +int match_pathspec(const char **pathspec, const char *name, int namelen, int prefix, char *seen) +{ + int retval; + const char *match; + + name += prefix; + namelen -= prefix; + + for (retval = 0; (match = *pathspec++) != NULL; seen++) { + if (retval & *seen) + continue; + match += prefix; + if (match_one(match, name, namelen)) { + retval = 1; + *seen = 1; + } + } + return retval; +} + +void add_exclude(const char *string, const char *base, + int baselen, struct exclude_list *which) +{ + struct exclude *x = xmalloc(sizeof (*x)); + + x->pattern = string; + x->base = base; + x->baselen = baselen; + if (which->nr == which->alloc) { + which->alloc = alloc_nr(which->alloc); + which->excludes = realloc(which->excludes, + which->alloc * sizeof(x)); + } + which->excludes[which->nr++] = x; +} + +static int add_excludes_from_file_1(const char *fname, + const char *base, + int baselen, + struct exclude_list *which) +{ + int fd, i; + long size; + char *buf, *entry; + + fd = open(fname, O_RDONLY); + if (fd < 0) + goto err; + size = lseek(fd, 0, SEEK_END); + if (size < 0) + goto err; + lseek(fd, 0, SEEK_SET); + if (size == 0) { + close(fd); + return 0; + } + buf = xmalloc(size+1); + if (read(fd, buf, size) != size) + goto err; + close(fd); + + buf[size++] = '\n'; + entry = buf; + for (i = 0; i < size; i++) { + if (buf[i] == '\n') { + if (entry != buf + i && entry[0] != '#') { + buf[i - (i && buf[i-1] == '\r')] = 0; + add_exclude(entry, base, baselen, which); + } + entry = buf + i + 1; + } + } + return 0; + + err: + if (0 <= fd) + close(fd); + return -1; +} + +void add_excludes_from_file(struct dir_struct *dir, const char *fname) +{ + if (add_excludes_from_file_1(fname, "", 0, + &dir->exclude_list[EXC_FILE]) < 0) + die("cannot use %s as an exclude file", fname); +} + +static int push_exclude_per_directory(struct dir_struct *dir, const char *base, int baselen) +{ + char exclude_file[PATH_MAX]; + struct exclude_list *el = &dir->exclude_list[EXC_DIRS]; + int current_nr = el->nr; + + if (dir->exclude_per_dir) { + memcpy(exclude_file, base, baselen); + strcpy(exclude_file + baselen, dir->exclude_per_dir); + add_excludes_from_file_1(exclude_file, base, baselen, el); + } + return current_nr; +} + +static void pop_exclude_per_directory(struct dir_struct *dir, int stk) +{ + struct exclude_list *el = &dir->exclude_list[EXC_DIRS]; + + while (stk < el->nr) + free(el->excludes[--el->nr]); +} + +/* Scan the list and let the last match determines the fate. + * Return 1 for exclude, 0 for include and -1 for undecided. + */ +static int excluded_1(const char *pathname, + int pathlen, + struct exclude_list *el) +{ + int i; + + if (el->nr) { + for (i = el->nr - 1; 0 <= i; i--) { + struct exclude *x = el->excludes[i]; + const char *exclude = x->pattern; + int to_exclude = 1; + + if (*exclude == '!') { + to_exclude = 0; + exclude++; + } + + if (!strchr(exclude, '/')) { + /* match basename */ + const char *basename = strrchr(pathname, '/'); + basename = (basename) ? basename+1 : pathname; + if (fnmatch(exclude, basename, 0) == 0) + return to_exclude; + } + else { + /* match with FNM_PATHNAME: + * exclude has base (baselen long) implicitly + * in front of it. + */ + int baselen = x->baselen; + if (*exclude == '/') + exclude++; + + if (pathlen < baselen || + (baselen && pathname[baselen-1] != '/') || + strncmp(pathname, x->base, baselen)) + continue; + + if (fnmatch(exclude, pathname+baselen, + FNM_PATHNAME) == 0) + return to_exclude; + } + } + } + return -1; /* undecided */ +} + +int excluded(struct dir_struct *dir, const char *pathname) +{ + int pathlen = strlen(pathname); + int st; + + for (st = EXC_CMDL; st <= EXC_FILE; st++) { + switch (excluded_1(pathname, pathlen, &dir->exclude_list[st])) { + case 0: + return 0; + case 1: + return 1; + } + } + return 0; +} + +static void add_name(struct dir_struct *dir, const char *pathname, int len) +{ + struct dir_entry *ent; + + if (cache_name_pos(pathname, len) >= 0) + return; + + if (dir->nr == dir->alloc) { + int alloc = alloc_nr(dir->alloc); + dir->alloc = alloc; + dir->entries = xrealloc(dir->entries, alloc*sizeof(ent)); + } + ent = xmalloc(sizeof(*ent) + len + 1); + ent->len = len; + memcpy(ent->name, pathname, len); + ent->name[len] = 0; + dir->entries[dir->nr++] = ent; +} + +static int dir_exists(const char *dirname, int len) +{ + int pos = cache_name_pos(dirname, len); + if (pos >= 0) + return 1; + pos = -pos-1; + if (pos >= active_nr) /* can't */ + return 0; + return !strncmp(active_cache[pos]->name, dirname, len); +} + +/* + * Read a directory tree. We currently ignore anything but + * directories, regular files and symlinks. That's because git + * doesn't handle them at all yet. Maybe that will change some + * day. + * + * Also, we ignore the name ".git" (even if it is not a directory). + * That likely will not change. + */ +static int read_directory_recursive(struct dir_struct *dir, const char *path, const char *base, int baselen) +{ + DIR *fdir = opendir(path); + int contents = 0; + + if (fdir) { + int exclude_stk; + struct dirent *de; + char fullname[MAXPATHLEN + 1]; + memcpy(fullname, base, baselen); + + exclude_stk = push_exclude_per_directory(dir, base, baselen); + + while ((de = readdir(fdir)) != NULL) { + int len; + + if ((de->d_name[0] == '.') && + (de->d_name[1] == 0 || + !strcmp(de->d_name + 1, ".") || + !strcmp(de->d_name + 1, "git"))) + continue; + len = strlen(de->d_name); + memcpy(fullname + baselen, de->d_name, len+1); + if (excluded(dir, fullname) != dir->show_ignored) { + if (!dir->show_ignored || DTYPE(de) != DT_DIR) { + continue; + } + } + + switch (DTYPE(de)) { + struct stat st; + int subdir, rewind_base; + default: + continue; + case DT_UNKNOWN: + if (lstat(fullname, &st)) + continue; + if (S_ISREG(st.st_mode) || S_ISLNK(st.st_mode)) + break; + if (!S_ISDIR(st.st_mode)) + continue; + /* fallthrough */ + case DT_DIR: + memcpy(fullname + baselen + len, "/", 2); + len++; + rewind_base = dir->nr; + subdir = read_directory_recursive(dir, fullname, fullname, + baselen + len); + if (dir->show_other_directories && + (subdir || !dir->hide_empty_directories) && + !dir_exists(fullname, baselen + len)) { + // Rewind the read subdirectory + while (dir->nr > rewind_base) + free(dir->entries[--dir->nr]); + break; + } + contents += subdir; + continue; + case DT_REG: + case DT_LNK: + break; + } + add_name(dir, fullname, baselen + len); + contents++; + } + closedir(fdir); + + pop_exclude_per_directory(dir, exclude_stk); + } + + return contents; +} + +static int cmp_name(const void *p1, const void *p2) +{ + const struct dir_entry *e1 = *(const struct dir_entry **)p1; + const struct dir_entry *e2 = *(const struct dir_entry **)p2; + + return cache_name_compare(e1->name, e1->len, + e2->name, e2->len); +} + +int read_directory(struct dir_struct *dir, const char *path, const char *base, int baselen) +{ + /* + * Make sure to do the per-directory exclude for all the + * directories leading up to our base. + */ + if (baselen) { + if (dir->exclude_per_dir) { + char *p, *pp = xmalloc(baselen+1); + memcpy(pp, base, baselen+1); + p = pp; + while (1) { + char save = *p; + *p = 0; + push_exclude_per_directory(dir, pp, p-pp); + *p++ = save; + if (!save) + break; + p = strchr(p, '/'); + if (p) + p++; + else + p = pp + baselen; + } + free(pp); + } + } + + read_directory_recursive(dir, path, base, baselen); + qsort(dir->entries, dir->nr, sizeof(struct dir_entry *), cmp_name); + return dir->nr; +} |