diff options
Diffstat (limited to 'abspath.c')
| -rw-r--r-- | abspath.c | 75 |
1 files changed, 66 insertions, 9 deletions
@@ -14,7 +14,14 @@ int is_directory(const char *path) /* We allow "recursive" symbolic links. Only within reason, though. */ #define MAXDEPTH 5 -const char *make_absolute_path(const char *path) +/* + * Use this to get the real path, i.e. resolve links. If you want an + * absolute path but don't mind links, use absolute_path. + * + * If path is our buffer, then return path, as it's already what the + * user wants. + */ +const char *real_path(const char *path) { static char bufs[2][PATH_MAX + 1], *buf = bufs[0], *next_buf = bufs[1]; char cwd[1024] = ""; @@ -24,15 +31,22 @@ const char *make_absolute_path(const char *path) char *last_elem = NULL; struct stat st; + /* We've already done it */ + if (path == buf || path == next_buf) + return path; + + if (!*path) + die("The empty string is not a valid path"); + if (strlcpy(buf, path, PATH_MAX) >= PATH_MAX) die ("Too long path: %.*s", 60, path); while (depth--) { if (!is_directory(buf)) { - char *last_slash = strrchr(buf, '/'); + char *last_slash = find_last_dir_sep(buf); if (last_slash) { - *last_slash = '\0'; last_elem = xstrdup(last_slash + 1); + last_slash[1] = '\0'; } else { last_elem = xstrdup(buf); *buf = '\0'; @@ -54,8 +68,9 @@ const char *make_absolute_path(const char *path) if (len + strlen(last_elem) + 2 > PATH_MAX) die ("Too long path name: '%s/%s'", buf, last_elem); - buf[len] = '/'; - strcpy(buf + len + 1, last_elem); + if (len && !is_dir_sep(buf[len-1])) + buf[len++] = '/'; + strcpy(buf + len, last_elem); free(last_elem); last_elem = NULL; } @@ -90,7 +105,8 @@ static const char *get_pwd_cwd(void) pwd = getenv("PWD"); if (pwd && strcmp(pwd, cwd)) { stat(cwd, &cwd_stat); - if (!stat(pwd, &pwd_stat) && + if ((cwd_stat.st_dev || cwd_stat.st_ino) && + !stat(pwd, &pwd_stat) && pwd_stat.st_dev == cwd_stat.st_dev && pwd_stat.st_ino == cwd_stat.st_ino) { strlcpy(cwd, pwd, PATH_MAX); @@ -99,19 +115,60 @@ static const char *get_pwd_cwd(void) return cwd; } -const char *make_nonrelative_path(const char *path) +/* + * Use this to get an absolute path from a relative one. If you want + * to resolve links, you should use real_path. + * + * If the path is already absolute, then return path. As the user is + * never meant to free the return value, we're safe. + */ +const char *absolute_path(const char *path) { static char buf[PATH_MAX + 1]; - if (is_absolute_path(path)) { + if (!*path) { + die("The empty string is not a valid path"); + } else if (is_absolute_path(path)) { if (strlcpy(buf, path, PATH_MAX) >= PATH_MAX) die("Too long path: %.*s", 60, path); } else { + size_t len; + const char *fmt; const char *cwd = get_pwd_cwd(); if (!cwd) die_errno("Cannot determine the current working directory"); - if (snprintf(buf, PATH_MAX, "%s/%s", cwd, path) >= PATH_MAX) + len = strlen(cwd); + fmt = (len > 0 && is_dir_sep(cwd[len-1])) ? "%s%s" : "%s/%s"; + if (snprintf(buf, PATH_MAX, fmt, cwd, path) >= PATH_MAX) die("Too long path: %.*s", 60, path); } return buf; } + +/* + * Unlike prefix_path, this should be used if the named file does + * not have to interact with index entry; i.e. name of a random file + * on the filesystem. + */ +const char *prefix_filename(const char *pfx, int pfx_len, const char *arg) +{ + static char path[PATH_MAX]; +#ifndef WIN32 + if (!pfx_len || is_absolute_path(arg)) + return arg; + memcpy(path, pfx, pfx_len); + strcpy(path + pfx_len, arg); +#else + char *p; + /* don't add prefix to absolute paths, but still replace '\' by '/' */ + if (is_absolute_path(arg)) + pfx_len = 0; + else if (pfx_len) + memcpy(path, pfx, pfx_len); + strcpy(path + pfx_len, arg); + for (p = path + pfx_len; *p; p++) + if (*p == '\\') + *p = '/'; +#endif + return path; +} |