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valuating PUT's argument unconditionally into a temporary before checking the buffer bound

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Harshit-Dhanwalkar 2026-06-17 10:49:27 +05:30
parent 14cc7dcc2e
commit b179ccb32c
1 changed files with 7 additions and 5 deletions
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12
C/lib/nl_printf.c
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@ -1,4 +1,5 @@
#include "nolibc.h"
#include <stdarg.h>
#include <stddef.h>
@ -44,13 +45,16 @@ int nl_vsnprintf(char *buf, size_t size, const char *fmt, va_list ap) {
#define PUT(c) \
do { \
char _ch = (c); \
if (pos + 1 < size) \
buf[pos++] = (c); \
buf[pos++] = _ch; \
} while (0)
while (*fmt) {
if (*fmt != '%') {
PUT(*fmt++);
char ch = *fmt;
fmt++;
PUT(ch);
continue;
}
fmt++; // skip '%'
@ -163,6 +167,4 @@ int nl_snprintf(char *buf, size_t size, const char *fmt, ...) {
return r;
}
void nl_eprint(const char *msg) {
nl_write(2, msg, nl_strlen(msg));
}
void nl_eprint(const char *msg) { nl_write(2, msg, nl_strlen(msg)); }