38 lines
1 KiB
Diff
38 lines
1 KiB
Diff
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Reduce the initial buffer size for open_memstream (used by vasprintf),
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as most strings are usually smaller than that.
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Realloc the buffer after finishing the string to further reduce size.
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Signed-off-by: Felix Fietkau <nbd@openwrt.org>
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--- a/libc/stdio/vasprintf.c
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+++ b/libc/stdio/vasprintf.c
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@@ -39,6 +39,8 @@ int vasprintf(char **__restrict buf, con
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if (rv < 0) {
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free(*buf);
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*buf = NULL;
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+ } else {
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+ *buf = realloc(*buf, rv + 1);
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}
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}
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--- a/libc/stdio/open_memstream.c
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+++ b/libc/stdio/open_memstream.c
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@@ -17,6 +17,8 @@
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#define COOKIE ((__oms_cookie *) cookie)
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+#define MEMSTREAM_BUFSIZ 256
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+
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typedef struct {
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char *buf;
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size_t len;
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@@ -134,7 +136,7 @@ FILE *open_memstream(char **__restrict b
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register FILE *fp;
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if ((cookie = malloc(sizeof(__oms_cookie))) != NULL) {
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- if ((cookie->buf = malloc(cookie->len = BUFSIZ)) == NULL) {
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+ if ((cookie->buf = malloc(cookie->len = MEMSTREAM_BUFSIZ)) == NULL) {
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goto EXIT_cookie;
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}
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*cookie->buf = 0; /* Set nul terminator for buffer. */
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