diff options
Diffstat (limited to 'lib/libc/stdio/vasprintf.c')
| -rw-r--r-- | lib/libc/stdio/vasprintf.c | 23 |
1 files changed, 16 insertions, 7 deletions
diff --git a/lib/libc/stdio/vasprintf.c b/lib/libc/stdio/vasprintf.c index 09c89c29514f..6b728e5ff8fc 100644 --- a/lib/libc/stdio/vasprintf.c +++ b/lib/libc/stdio/vasprintf.c @@ -24,7 +24,7 @@ */ #if defined(LIBC_RCS) && !defined(lint) -static char rcsid[] = "$Id: vasprintf.c,v 1.1 1996/05/27 10:49:43 peter Exp $"; +static char rcsid[] = "$Id: vasprintf.c,v 1.2 1996/06/22 10:34:01 jraynard Exp $"; #endif /* LIBC_RCS and not lint */ #include <stdio.h> @@ -40,8 +40,8 @@ static char rcsid[] = "$Id: vasprintf.c,v 1.1 1996/05/27 10:49:43 peter Exp $"; struct bufcookie { char *base; /* start of buffer */ - int size; - int left; + size_t size; + size_t left; }; static int writehook __P((void *cookie, const char *, int)); @@ -53,22 +53,31 @@ writehook(cookie, buf, len) int len; { struct bufcookie *h = (struct bufcookie *)cookie; + char *newbuf; if (len == 0) return 0; if (len > h->left) { /* grow malloc region */ + /* + * XXX this is linearly expanded, which is slow for obscenely + * large strings. + */ h->left = h->left + len + CHUNK_SPARE; h->size = h->size + len + CHUNK_SPARE; - h->base = realloc(h->base, (size_t)h->size); - if (h->base == NULL) + newbuf = realloc(h->base, h->size); + if (newbuf == NULL) { + free(h->base); + h->base = NULL; return (-1); + } else + h->base = newbuf; } /* "write" it */ (void)memcpy(h->base + h->size - h->left, buf, (size_t)len); h->left -= len; - return (0); + return (len); } @@ -105,6 +114,6 @@ vasprintf(str, fmt, ap) h.base[h.size - h.left] = '\0'; *str = realloc(h.base, (size_t)(h.size - h.left + 1)); if (*str == NULL) /* failed to realloc it to actual size */ - return -1; + *str = h.base; /* return oversize buffer */ return (ret); } |