From: Denis Vlasenko Date: Sat, 21 Mar 2009 19:11:23 +0000 (-0000) Subject: ls: make readlink error to not disrupt output (try ls -l /proc/self/fd). X-Git-Tag: 1_14_0~202 X-Git-Url: https://git.librecmc.org/?a=commitdiff_plain;h=3a014b85dc57a88b5e1eb006a2fa3062f4bebc8f;p=oweals%2Fbusybox.git ls: make readlink error to not disrupt output (try ls -l /proc/self/fd). libbb: make xmalloc_readlink_or_warn warning more specific. function old new delta xmalloc_readlink_or_warn 33 61 +28 showfiles 1495 1460 -35 ------------------------------------------------------------------------------ (add/remove: 0/0 grow/shrink: 1/1 up/down: 28/-35) Total: -7 bytes --- diff --git a/coreutils/ls.c b/coreutils/ls.c index 8007f2a2e..85c6729ea 100644 --- a/coreutils/ls.c +++ b/coreutils/ls.c @@ -76,7 +76,7 @@ LIST_ID_NAME = 1 << 4, LIST_ID_NUMERIC = 1 << 5, LIST_CONTEXT = 1 << 6, LIST_SIZE = 1 << 7, -LIST_DEV = 1 << 8, +//LIST_DEV = 1 << 8, - unused, synonym to LIST_SIZE LIST_DATE_TIME = 1 << 9, LIST_FULLTIME = 1 << 10, LIST_FILENAME = 1 << 11, @@ -741,8 +741,8 @@ static int print_name(const char *name) static int list_single(const struct dnode *dn) { - int i, column = 0; - + int column = 0; + char *lpath; #if ENABLE_FEATURE_LS_TIMESTAMPS char *filetime; time_t ttime, age; @@ -767,127 +767,123 @@ static int list_single(const struct dnode *dn) append = append_char(dn->dstat.st_mode); #endif - for (i = 0; i <= 31; i++) { - switch (all_fmt & (1 << i)) { - case LIST_INO: - column += printf("%7lu ", (long) dn->dstat.st_ino); - break; - case LIST_BLOCKS: - column += printf("%4"OFF_FMT"u ", (off_t) dn->dstat.st_blocks >> 1); - break; - case LIST_MODEBITS: - column += printf("%-10s ", (char *) bb_mode_string(dn->dstat.st_mode)); - break; - case LIST_NLINKS: - column += printf("%4lu ", (long) dn->dstat.st_nlink); - break; - case LIST_ID_NAME: + /* Do readlink early, so that if it fails, error message + * does not appear *inside* of the "ls -l" line */ + if (all_fmt & LIST_SYMLINK) + if (S_ISLNK(dn->dstat.st_mode)) + lpath = xmalloc_readlink_or_warn(dn->fullname); + + if (all_fmt & LIST_INO) + column += printf("%7lu ", (long) dn->dstat.st_ino); + if (all_fmt & LIST_BLOCKS) + column += printf("%4"OFF_FMT"u ", (off_t) dn->dstat.st_blocks >> 1); + if (all_fmt & LIST_MODEBITS) + column += printf("%-10s ", (char *) bb_mode_string(dn->dstat.st_mode)); + if (all_fmt & LIST_NLINKS) + column += printf("%4lu ", (long) dn->dstat.st_nlink); #if ENABLE_FEATURE_LS_USERNAME - if (option_mask32 & OPT_g) { - printf("%-8.8s", - get_cached_username(dn->dstat.st_uid)); - column += 9; - break; - } - printf("%-8.8s %-8.8s", + if (all_fmt & LIST_ID_NAME) { + if (option_mask32 & OPT_g) { + column += printf("%-8.8s", + get_cached_username(dn->dstat.st_uid)); + } else { + column += printf("%-8.8s %-8.8s", get_cached_username(dn->dstat.st_uid), get_cached_groupname(dn->dstat.st_gid)); - column += 17; - break; + } + } #endif - case LIST_ID_NUMERIC: - column += printf("%-8u %-8u", dn->dstat.st_uid, dn->dstat.st_gid); - break; - case LIST_SIZE: - case LIST_DEV: - if (S_ISBLK(dn->dstat.st_mode) || S_ISCHR(dn->dstat.st_mode)) { - column += printf("%4u, %3u ", (int) major(dn->dstat.st_rdev), - (int) minor(dn->dstat.st_rdev)); + if (all_fmt & LIST_ID_NUMERIC) { + if (option_mask32 & OPT_g) + column += printf("%-8u", (int) dn->dstat.st_uid); + else + column += printf("%-8u %-8u", + (int) dn->dstat.st_uid, + (int) dn->dstat.st_gid); + } + if (all_fmt & (LIST_SIZE /*|LIST_DEV*/ )) { + if (S_ISBLK(dn->dstat.st_mode) || S_ISCHR(dn->dstat.st_mode)) { + column += printf("%4u, %3u ", + (int) major(dn->dstat.st_rdev), + (int) minor(dn->dstat.st_rdev)); + } else { + if (all_fmt & LS_DISP_HR) { + column += printf("%9s ", + make_human_readable_str(dn->dstat.st_size, 1, 0)); } else { - if (all_fmt & LS_DISP_HR) { - column += printf("%9s ", - make_human_readable_str(dn->dstat.st_size, 1, 0)); - } else { - column += printf("%9"OFF_FMT"u ", (off_t) dn->dstat.st_size); - } + column += printf("%9"OFF_FMT"u ", (off_t) dn->dstat.st_size); } - break; + } + } #if ENABLE_FEATURE_LS_TIMESTAMPS - case LIST_FULLTIME: - printf("%24.24s ", filetime); - column += 25; - break; - case LIST_DATE_TIME: - if ((all_fmt & LIST_FULLTIME) == 0) { - /* current_time_t ~== time(NULL) */ - age = current_time_t - ttime; - printf("%6.6s ", filetime + 4); - if (age < 3600L * 24 * 365 / 2 && age > -15 * 60) { - /* hh:mm if less than 6 months old */ - printf("%5.5s ", filetime + 11); - } else { - printf(" %4.4s ", filetime + 20); - } - column += 13; + if (all_fmt & LIST_FULLTIME) + column += printf("%24.24s ", filetime); + if (all_fmt & LIST_DATE_TIME) + if ((all_fmt & LIST_FULLTIME) == 0) { + /* current_time_t ~== time(NULL) */ + age = current_time_t - ttime; + printf("%6.6s ", filetime + 4); + if (age < 3600L * 24 * 365 / 2 && age > -15 * 60) { + /* hh:mm if less than 6 months old */ + printf("%5.5s ", filetime + 11); + } else { + printf(" %4.4s ", filetime + 20); } - break; + column += 13; + } #endif #if ENABLE_SELINUX - case LIST_CONTEXT: - column += printf("%-32s ", dn->sid ? dn->sid : "unknown"); - freecon(dn->sid); - break; + if (all_fmt & LIST_CONTEXT) { + column += printf("%-32s ", dn->sid ? dn->sid : "unknown"); + freecon(dn->sid); + } #endif - case LIST_FILENAME: + if (all_fmt & LIST_FILENAME) { #if ENABLE_FEATURE_LS_COLOR - if (show_color) { - info.st_mode = 0; /* for fgcolor() */ - lstat(dn->fullname, &info); - printf("\033[%u;%um", bold(info.st_mode), - fgcolor(info.st_mode)); - } + if (show_color) { + info.st_mode = 0; /* for fgcolor() */ + lstat(dn->fullname, &info); + printf("\033[%u;%um", bold(info.st_mode), + fgcolor(info.st_mode)); + } #endif - column += print_name(dn->name); - if (show_color) { - printf("\033[0m"); - } - break; - case LIST_SYMLINK: - if (S_ISLNK(dn->dstat.st_mode)) { - char *lpath = xmalloc_readlink_or_warn(dn->fullname); - if (!lpath) break; - printf(" -> "); + column += print_name(dn->name); + if (show_color) { + printf("\033[0m"); + } + } + if (all_fmt & LIST_SYMLINK) { + if (S_ISLNK(dn->dstat.st_mode) && lpath) { + printf(" -> "); #if ENABLE_FEATURE_LS_FILETYPES || ENABLE_FEATURE_LS_COLOR #if ENABLE_FEATURE_LS_COLOR - info.st_mode = 0; /* for fgcolor() */ + info.st_mode = 0; /* for fgcolor() */ #endif - if (stat(dn->fullname, &info) == 0) { - append = append_char(info.st_mode); - } + if (stat(dn->fullname, &info) == 0) { + append = append_char(info.st_mode); + } #endif #if ENABLE_FEATURE_LS_COLOR - if (show_color) { - printf("\033[%u;%um", bold(info.st_mode), - fgcolor(info.st_mode)); - } + if (show_color) { + printf("\033[%u;%um", bold(info.st_mode), + fgcolor(info.st_mode)); + } #endif - column += print_name(lpath) + 4; - if (show_color) { - printf("\033[0m"); - } - free(lpath); + column += print_name(lpath) + 4; + if (show_color) { + printf("\033[0m"); } - break; + free(lpath); + } + } #if ENABLE_FEATURE_LS_FILETYPES - case LIST_FILETYPE: - if (append) { - putchar(append); - column++; - } - break; -#endif + if (all_fmt & LIST_FILETYPE) { + if (append) { + putchar(append); + column++; } } +#endif return column; } diff --git a/libbb/xreadlink.c b/libbb/xreadlink.c index 6bff4beae..8d232f16b 100644 --- a/libbb/xreadlink.c +++ b/libbb/xreadlink.c @@ -91,7 +91,11 @@ char* FAST_FUNC xmalloc_readlink_or_warn(const char *path) char *buf = xmalloc_readlink(path); if (!buf) { /* EINVAL => "file: Invalid argument" => puzzled user */ - bb_error_msg("%s: cannot read link (not a symlink?)", path); + const char *errmsg = "not a symlink"; + int err = errno; + if (err != EINVAL) + errmsg = strerror(err); + bb_error_msg("%s: cannot read link: %s", path, errmsg); } return buf; }