diff options
Diffstat (limited to 'src/stat.c')
| -rw-r--r-- | src/stat.c | 47 |
1 files changed, 40 insertions, 7 deletions
diff --git a/src/stat.c b/src/stat.c index 99f115bca..ae7ce021f 100644 --- a/src/stat.c +++ b/src/stat.c @@ -150,6 +150,16 @@ statfs (char const *filename, struct fs_info *buf) #define hextobin(c) ((c) >= 'a' && (c) <= 'f' ? (c) - 'a' + 10 : \ (c) >= 'A' && (c) <= 'F' ? (c) - 'A' + 10 : (c) - '0') +static char const digits[] = "0123456789"; + +/* Flags that are portable for use in printf, for at least one + conversion specifier; make_format removes unportable flags as + needed for particular specifiers. The glibc 2.2 extension "I" is + listed here; it is removed by make_format because it has undefined + behavior elsewhere and because it is incompatible with + out_epoch_sec. */ +static char const printf_flags[] = "'-+ #0I"; + #define PROGRAM_NAME "stat" #define AUTHORS proper_name ("Michael Meskes") @@ -467,40 +477,59 @@ human_time (struct timespec t) return str; } +/* PFORMAT points to a '%' followed by a prefix of a format, all of + size PREFIX_LEN. The flags allowed for this format are + ALLOWED_FLAGS; remove other printf flags from the prefix, then + append SUFFIX. */ +static void +make_format (char *pformat, size_t prefix_len, char const *allowed_flags, + char const *suffix) +{ + char *dst = pformat + 1; + char const *src; + char const *srclim = pformat + prefix_len; + for (src = dst; src < srclim && strchr (printf_flags, *src); src++) + if (strchr (allowed_flags, *src)) + *dst++ = *src; + while (src < srclim) + *dst++ = *src++; + strcpy (dst, suffix); +} + static void out_string (char *pformat, size_t prefix_len, char const *arg) { - strcpy (pformat + prefix_len, "s"); + make_format (pformat, prefix_len, "-", "s"); printf (pformat, arg); } static int out_int (char *pformat, size_t prefix_len, intmax_t arg) { - strcpy (pformat + prefix_len, PRIdMAX); + make_format (pformat, prefix_len, "'-+ 0", PRIdMAX); return printf (pformat, arg); } static int out_uint (char *pformat, size_t prefix_len, uintmax_t arg) { - strcpy (pformat + prefix_len, PRIuMAX); + make_format (pformat, prefix_len, "'-0", PRIuMAX); return printf (pformat, arg); } static void out_uint_o (char *pformat, size_t prefix_len, uintmax_t arg) { - strcpy (pformat + prefix_len, PRIoMAX); + make_format (pformat, prefix_len, "-#0", PRIoMAX); printf (pformat, arg); } static void out_uint_x (char *pformat, size_t prefix_len, uintmax_t arg) { - strcpy (pformat + prefix_len, PRIxMAX); + make_format (pformat, prefix_len, "-#0", PRIxMAX); printf (pformat, arg); } static int out_minus_zero (char *pformat, size_t prefix_len) { - strcpy (pformat + prefix_len, ".0f"); + make_format (pformat, prefix_len, "'-+ 0", ".0f"); return printf (pformat, -0.25); } @@ -1028,8 +1057,12 @@ print_it (char const *format, char const *filename, { case '%': { - size_t len = strspn (b + 1, "#-+.I 0123456789"); + size_t len = strspn (b + 1, printf_flags); char const *fmt_char = b + len + 1; + fmt_char += strspn (fmt_char, digits); + if (*fmt_char == '.') + fmt_char += 1 + strspn (fmt_char + 1, digits); + len = fmt_char - (b + 1); unsigned int fmt_code = *fmt_char; memcpy (dest, b, len + 1); |