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Diffstat (limited to 'libbb/fgets_str.c')
-rw-r--r--libbb/fgets_str.c26
1 files changed, 23 insertions, 3 deletions
diff --git a/libbb/fgets_str.c b/libbb/fgets_str.c
index 8026a15..3fe61cd 100644
--- a/libbb/fgets_str.c
+++ b/libbb/fgets_str.c
@@ -10,7 +10,7 @@
#include "libbb.h"
-static char *xmalloc_fgets_internal(FILE *file, const char *terminating_string, int chop_off)
+static char *xmalloc_fgets_internal(FILE *file, const char *terminating_string, int chop_off, size_t *maxsz_p)
{
char *linebuf = NULL;
const int term_length = strlen(terminating_string);
@@ -18,6 +18,7 @@ static char *xmalloc_fgets_internal(FILE *file, const char *terminating_string,
int linebufsz = 0;
int idx = 0;
int ch;
+ size_t maxsz = *maxsz_p;
while (1) {
ch = fgetc(file);
@@ -30,6 +31,11 @@ static char *xmalloc_fgets_internal(FILE *file, const char *terminating_string,
if (idx >= linebufsz) {
linebufsz += 200;
linebuf = xrealloc(linebuf, linebufsz);
+ if (idx >= maxsz) {
+ linebuf[idx] = ch;
+ idx++;
+ break;
+ }
}
linebuf[idx] = ch;
@@ -48,6 +54,7 @@ static char *xmalloc_fgets_internal(FILE *file, const char *terminating_string,
/* Grow/shrink *first*, then store NUL */
linebuf = xrealloc(linebuf, idx + 1);
linebuf[idx] = '\0';
+ *maxsz_p = idx;
return linebuf;
}
@@ -57,10 +64,23 @@ static char *xmalloc_fgets_internal(FILE *file, const char *terminating_string,
* Return NULL if EOF is reached immediately. */
char* FAST_FUNC xmalloc_fgets_str(FILE *file, const char *terminating_string)
{
- return xmalloc_fgets_internal(file, terminating_string, 0);
+ size_t maxsz = INT_MAX - 4095;
+ return xmalloc_fgets_internal(file, terminating_string, 0, &maxsz);
+}
+
+char* FAST_FUNC xmalloc_fgets_str_len(FILE *file, const char *terminating_string, size_t *maxsz_p)
+{
+ size_t maxsz;
+
+ if (!maxsz_p) {
+ maxsz = INT_MAX - 4095;
+ maxsz_p = &maxsz;
+ }
+ return xmalloc_fgets_internal(file, terminating_string, 0, maxsz_p);
}
char* FAST_FUNC xmalloc_fgetline_str(FILE *file, const char *terminating_string)
{
- return xmalloc_fgets_internal(file, terminating_string, 1);
+ size_t maxsz = INT_MAX - 4095;
+ return xmalloc_fgets_internal(file, terminating_string, 1, &maxsz);
}