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-rw-r--r--source4/lib/talloc/talloc.c79
1 files changed, 29 insertions, 50 deletions
diff --git a/source4/lib/talloc/talloc.c b/source4/lib/talloc/talloc.c
index 0b4d977aa7..033e70d2f9 100644
--- a/source4/lib/talloc/talloc.c
+++ b/source4/lib/talloc/talloc.c
@@ -1313,30 +1313,18 @@ char *talloc_asprintf(const void *t, const char *fmt, ...)
return ret;
}
-
-/**
- * Realloc @p s to append the formatted result of @p fmt and @p ap,
- * and return @p s, which may have moved. Good for gradually
- * accumulating output into a string buffer. Appends at the end
- * of the string.
- **/
-char *talloc_vasprintf_append(char *s, const char *fmt, va_list ap)
+static inline char *__talloc_vaslenprintf_append(char *s, size_t slen,
+ const char *fmt, va_list ap)
{
- int len, s_len;
+ ssize_t alen;
va_list ap2;
char c;
- if (s == NULL) {
- return talloc_vasprintf(NULL, fmt, ap);
- }
-
- s_len = strlen(s);
-
va_copy(ap2, ap);
- len = vsnprintf(&c, 1, fmt, ap2);
+ alen = vsnprintf(&c, 1, fmt, ap2);
va_end(ap2);
- if (len <= 0) {
+ if (alen <= 0) {
/* Either the vsnprintf failed or the format resulted in
* no characters being formatted. In the former case, we
* ought to return NULL, in the latter we ought to return
@@ -1346,60 +1334,51 @@ char *talloc_vasprintf_append(char *s, const char *fmt, va_list ap)
return s;
}
- s = talloc_realloc(NULL, s, char, s_len + len+1);
+ s = talloc_realloc(NULL, s, char, slen + alen + 1);
if (!s) return NULL;
va_copy(ap2, ap);
- vsnprintf(s+s_len, len+1, fmt, ap2);
+ vsnprintf(s + slen, alen + 1, fmt, ap2);
va_end(ap2);
- _talloc_set_name_const(s, s);
+ _talloc_set_name_const(s, s);
return s;
}
/**
* Realloc @p s to append the formatted result of @p fmt and @p ap,
+ * and return @p s, which may have moved. Good for gradually
+ * accumulating output into a string buffer. Appends at the end
+ * of the string.
+ **/
+char *talloc_vasprintf_append(char *s, const char *fmt, va_list ap)
+{
+ if (unlikely(!s)) {
+ return talloc_vasprintf(NULL, fmt, ap);
+ }
+
+ return __talloc_vaslenprintf_append(s, strlen(s), fmt, ap);
+}
+
+/**
+ * Realloc @p s to append the formatted result of @p fmt and @p ap,
* and return @p s, which may have moved. Always appends at the
* end of the talloc'ed buffer, not the end of the string.
**/
char *talloc_vasprintf_append_buffer(char *s, const char *fmt, va_list ap)
{
- struct talloc_chunk *tc;
- int len, s_len;
- va_list ap2;
- char c;
+ size_t slen;
- if (s == NULL) {
+ if (unlikely(!s)) {
return talloc_vasprintf(NULL, fmt, ap);
}
- tc = talloc_chunk_from_ptr(s);
-
- s_len = tc->size - 1;
-
- va_copy(ap2, ap);
- len = vsnprintf(&c, 1, fmt, ap2);
- va_end(ap2);
-
- if (len <= 0) {
- /* Either the vsnprintf failed or the format resulted in
- * no characters being formatted. In the former case, we
- * ought to return NULL, in the latter we ought to return
- * the original string. Most current callers of this
- * function expect it to never return NULL.
- */
- return s;
+ slen = talloc_get_size(s);
+ if (likely(slen > 0)) {
+ slen--;
}
- s = talloc_realloc(NULL, s, char, s_len + len+1);
- if (!s) return NULL;
-
- va_copy(ap2, ap);
- vsnprintf(s+s_len, len+1, fmt, ap2);
- va_end(ap2);
- _talloc_set_name_const(s, s);
-
- return s;
+ return __talloc_vaslenprintf_append(s, slen, fmt, ap);
}
/*