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respect the input length when copying in str_escape_ex.

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This commit is contained in:
Enno Rehling 2018-05-27 15:15:31 +02:00
parent 5af3ac1b40
commit 034872c44e
1 changed files with 14 additions and 2 deletions
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16
src/util/strings.c
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@ -312,10 +312,13 @@ char *str_unescape(char *str) {
const char *str_escape_ex(const char *str, char *buffer, size_t size, const char *chars)
{
size_t slen = strlen(str);
const char *read = str;
char *write = buffer;
if (size < 1) return NULL;
while (size > 1 && *read) {
if (size < 1) {
return NULL;
}
while (slen > 0 && size > 1 && *read) {
const char *pos = strpbrk(read, chars);
size_t len = size;
if (pos) {
@ -324,7 +327,11 @@ const char *str_escape_ex(const char *str, char *buffer, size_t size, const char
if (len < size) {
unsigned char ch = *(const unsigned char *)pos;
if (len > 0) {
if (len > slen) {
len = slen;
}
memmove(write, read, len);
slen -= len;
write += len;
read += len;
size -= len;
@ -376,13 +383,18 @@ const char *str_escape_ex(const char *str, char *buffer, size_t size, const char
else size = 1;
}
++read;
--slen;
} else {
/* end of buffer space */
len = size - 1;
if (len > 0) {
if (len > slen) {
len = slen;
}
memmove(write, read, len);
write += len;
size -= len;
slen -= len;
break;
}
}