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tool_urlglob: parse character globbing range without sscanf

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A step towards a future without sscanf() calls.

Closes #15682
This commit is contained in:
Daniel Stenberg 2024-12-04 13:45:21 +01:00
parent c948971e83
commit 03669b630e
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GPG key ID: 5CC908FDB71E12C2
1 changed files with 11 additions and 8 deletions
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19
src/tool_urlglob.c
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@ -191,7 +191,6 @@ static CURLcode glob_range(struct URLGlob *glob, char **patternp,
expression is checked for well-formedness and collected until the next ']'
*/
struct URLPattern *pat;
int rc;
char *pattern = *patternp;
char *c;
@ -200,16 +199,20 @@ static CURLcode glob_range(struct URLGlob *glob, char **patternp,
if(ISALPHA(*pattern)) {
/* character range detected */
char min_c;
char max_c;
char end_c;
bool pmatch = FALSE;
char min_c = 0;
char max_c = 0;
char end_c = 0;
unsigned long step = 1;
pat->type = UPTCharRange;
rc = sscanf(pattern, "%c-%c%c", &min_c, &max_c, &end_c);
if((pattern[1] == '-') && pattern[2] && pattern[3]) {
min_c = pattern[0];
max_c = pattern[2];
end_c = pattern[3];
pmatch = TRUE;
if(rc == 3) {
if(end_c == ':') {
char *endp;
errno = 0;
@ -221,7 +224,7 @@ static CURLcode glob_range(struct URLGlob *glob, char **patternp,
}
else if(end_c != ']')
/* then this is wrong */
rc = 0;
pmatch = FALSE;
else
/* end_c == ']' */
pattern += 4;
@ -229,7 +232,7 @@ static CURLcode glob_range(struct URLGlob *glob, char **patternp,
*posp += (pattern - *patternp);
if(rc != 3 || !step || step > (unsigned)INT_MAX ||
if(!pmatch || !step || step > (unsigned)INT_MAX ||
(min_c == max_c && step != 1) ||
(min_c != max_c && (min_c > max_c || step > (unsigned)(max_c - min_c) ||
(max_c - min_c) > ('z' - 'a'))))