From 6ad38d66d08a2646c6423b967a790656ae026c95 Mon Sep 17 00:00:00 2001 From: Ron Yorston Date: Sat, 23 Jan 2021 13:22:33 +0000 Subject: [PATCH] libbb: code shrink fgets_str Use a NULL value of maxsz_p to indicate to xmalloc_fgets_internal() that the caller doesn't care about the maximum size of the buffer. This allows the default maximum size to be set once in xmalloc_fgets_internal() instead of separately in each caller. function old new delta xmalloc_fgets_internal 273 287 +14 xmalloc_fgets_str 30 9 -21 xmalloc_fgetline_str 33 12 -21 xmalloc_fgets_str_len 38 10 -28 ------------------------------------------------------------------------------ (add/remove: 0/0 grow/shrink: 1/3 up/down: 14/-70) Total: -56 bytes Signed-off-by: Ron Yorston Signed-off-by: Denys Vlasenko --- libbb/fgets_str.c | 17 +++++------------ 1 file changed, 5 insertions(+), 12 deletions(-) diff --git a/libbb/fgets_str.c b/libbb/fgets_str.c index 1a7f2e9e0..c884ef8af 100644 --- a/libbb/fgets_str.c +++ b/libbb/fgets_str.c @@ -17,7 +17,7 @@ static char *xmalloc_fgets_internal(FILE *file, const char *terminating_string, int linebufsz = 0; int idx = 0; int ch; - size_t maxsz = *maxsz_p; + size_t maxsz = maxsz_p ? *maxsz_p : INT_MAX - 4095; while (1) { ch = fgetc(file); @@ -53,7 +53,8 @@ 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; + if (maxsz_p) + *maxsz_p = idx; return linebuf; } @@ -63,23 +64,15 @@ 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) { - size_t maxsz = INT_MAX - 4095; - return xmalloc_fgets_internal(file, terminating_string, 0, &maxsz); + return xmalloc_fgets_internal(file, terminating_string, 0, NULL); } 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) { - size_t maxsz = INT_MAX - 4095; - return xmalloc_fgets_internal(file, terminating_string, 1, &maxsz); + return xmalloc_fgets_internal(file, terminating_string, 1, NULL); }