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authorwm4 <wm4@nowhere>2014-07-01 23:10:38 +0200
committerwm4 <wm4@nowhere>2014-07-01 23:11:08 +0200
commit9a210ca2d50e02bf045866bbb2f44a33a3c48cd9 (patch)
tree9f685c66c9d3b2e968416c7f60d30ea56ab1f9bb /sub
parent0208ad4f3b4d2331b8242bb6fb12a9a4475ccae6 (diff)
downloadmpv-9a210ca2d50e02bf045866bbb2f44a33a3c48cd9.tar.bz2
mpv-9a210ca2d50e02bf045866bbb2f44a33a3c48cd9.tar.xz
Audit and replace all ctype.h uses
Something like "char *s = ...; isdigit(s[0]);" triggers undefined behavior, because char can be signed, and thus s[0] can be a negative value. The is*() functions require unsigned char _or_ EOF. EOF is a special value outside of unsigned char range, thus the argument to the is*() functions can't be a char. This undefined behavior can actually trigger crashes if the implementation of these functions e.g. uses lookup tables, which are then indexed with out-of-range values. Replace all <ctype.h> uses with our own custom mp_is*() functions added with misc/ctype.h. As a bonus, these functions are locale-independent. (Although currently, we _require_ C locale for other reasons.)
Diffstat (limited to 'sub')
-rw-r--r--sub/find_subfiles.c6
-rw-r--r--sub/sd_microdvd.c1
-rw-r--r--sub/sd_srt.c12
3 files changed, 9 insertions, 10 deletions
diff --git a/sub/find_subfiles.c b/sub/find_subfiles.c
index 9313bf379d..ade267cfa6 100644
--- a/sub/find_subfiles.c
+++ b/sub/find_subfiles.c
@@ -1,16 +1,16 @@
#include <dirent.h>
#include <string.h>
#include <stdlib.h>
-#include <ctype.h>
#include <assert.h>
#include "osdep/io.h"
+#include "common/common.h"
#include "common/global.h"
#include "common/msg.h"
+#include "misc/ctype.h"
#include "options/options.h"
#include "options/path.h"
-#include "common/common.h"
#include "sub/find_subfiles.h"
static const char *const sub_exts[] = {"utf", "utf8", "utf-8", "idx", "sub", "srt",
@@ -75,7 +75,7 @@ static struct bstr guess_lang_from_filename(struct bstr name)
if (name.start[i] == ')' || name.start[i] == ']')
i--;
- while (i >= 0 && isalpha(name.start[i])) {
+ while (i >= 0 && mp_isalpha(name.start[i])) {
n++;
if (n > 3)
return (struct bstr){NULL, 0};
diff --git a/sub/sd_microdvd.c b/sub/sd_microdvd.c
index 6e6a9c31a8..5de9a1814b 100644
--- a/sub/sd_microdvd.c
+++ b/sub/sd_microdvd.c
@@ -24,7 +24,6 @@
#include <stdio.h>
#include <stdarg.h>
#include <stdbool.h>
-#include <ctype.h>
#include <libavutil/common.h>
#include "common/msg.h"
diff --git a/sub/sd_srt.c b/sub/sd_srt.c
index 733a27d0f4..0ca807f312 100644
--- a/sub/sd_srt.c
+++ b/sub/sd_srt.c
@@ -24,11 +24,11 @@
#include <stdio.h>
#include <stdarg.h>
#include <stdbool.h>
-#include <ctype.h>
-#include <libavutil/common.h>
+#include "common/common.h"
#include "common/msg.h"
#include "bstr/bstr.h"
+#include "misc/ctype.h"
#include "sd.h"
struct line {
@@ -259,7 +259,7 @@ static int read_attr(char **s, struct bstr *attr, struct bstr *val)
attr->start = *s;
attr->len = eq - *s;
for (int i = 0; i < attr->len; i++)
- if (!isalnum(attr->start[i]))
+ if (!mp_isalnum(attr->start[i]))
return -1;
val->start = eq + 1;
bool quoted = val->start[0] == '"';
@@ -290,7 +290,7 @@ static void convert_subrip(struct sd *sd, const char *orig,
while (*line && new_line.len < new_line.bufsize - 1) {
char *orig_line = line;
- for (int i = 0; i < FF_ARRAY_ELEMS(subrip_basic_tags); i++) {
+ for (int i = 0; i < MP_ARRAY_SIZE(subrip_basic_tags); i++) {
const struct tag_conv *tag = &subrip_basic_tags[i];
int from_len = strlen(tag->from);
if (strncmp(line, tag->from, from_len) == 0) {
@@ -331,7 +331,7 @@ static void convert_subrip(struct sd *sd, const char *orig,
}
}
} else if (strncmp(line, "<font ", 6) == 0
- && sp + 1 < FF_ARRAY_ELEMS(font_stack)) {
+ && sp + 1 < MP_ARRAY_SIZE(font_stack)) {
/* Opening font tag */
char *potential_font_tag_start = line;
int len_backup = new_line.len;
@@ -360,7 +360,7 @@ static void convert_subrip(struct sd *sd, const char *orig,
int found = 0;
// Try to lookup the string in standard web colors
- for (int i = 0; i < FF_ARRAY_ELEMS(subrip_web_colors); i++) {
+ for (int i = 0; i < MP_ARRAY_SIZE(subrip_web_colors); i++) {
char *color = subrip_web_colors[i].s;
if (bstrcasecmp(val, bstr0(color)) == 0) {
uint32_t xcolor = subrip_web_colors[i].v;