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asprintf.c: fix the critical bug: copy the arguments

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パチュリー・ノーレッジ 2024-12-30 23:49:50 +03:00
parent 545ac7e706
commit ae71ff9c42
Signed by: 80486DX2-66
GPG Key ID: 83631EF27054609B
1 changed files with 7 additions and 1 deletions
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8
c-programming/strings/asprintf.c
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@ -12,9 +12,13 @@ ssize_t asprintf(char** strp, char* format, ...) {
va_list args; va_list args;
va_start(args, format); va_start(args, format);
va_list args_copy;
va_copy(args_copy, args);
ssize_t result = (ssize_t) vsnprintf(NULL, 0, format, args); ssize_t result = (ssize_t) vsnprintf(NULL, 0, format, args);
if (result < 0) { if (result < 0) {
va_end(args); va_end(args);
va_end(args_copy);
return -1; return -1;
} }
@ -22,11 +26,13 @@ ssize_t asprintf(char** strp, char* format, ...) {
*strp = malloc(size * sizeof(char)); *strp = malloc(size * sizeof(char));
if (*strp == NULL) { if (*strp == NULL) {
va_end(args); va_end(args);
va_end(args_copy);
return -1; return -1;
} }
result = (ssize_t) vsnprintf(*strp, size, format, args); result = (ssize_t) vsnprintf(*strp, size, format, args_copy);
va_end(args); va_end(args);
va_end(args_copy);
if (result < 0) { if (result < 0) {
free(*strp); free(*strp);