diff options
Diffstat (limited to 'contrib/mdocml/compat_vasprintf.c')
-rw-r--r-- | contrib/mdocml/compat_vasprintf.c | 56 |
1 files changed, 56 insertions, 0 deletions
diff --git a/contrib/mdocml/compat_vasprintf.c b/contrib/mdocml/compat_vasprintf.c new file mode 100644 index 0000000..9040822 --- /dev/null +++ b/contrib/mdocml/compat_vasprintf.c @@ -0,0 +1,56 @@ +#include "config.h" + +#if HAVE_VASPRINTF + +int dummy; + +#else + +/* $Id: compat_vasprintf.c,v 1.3 2015/10/06 18:32:19 schwarze Exp $ */ +/* + * Copyright (c) 2015 Ingo Schwarze <schwarze@openbsd.org> + * + * Permission to use, copy, modify, and distribute this software for any + * purpose with or without fee is hereby granted, provided that the above + * copyright notice and this permission notice appear in all copies. + * + * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES + * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF + * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR + * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES + * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN + * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF + * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. + * + * This fallback implementation is not efficient: + * It does the formatting twice. + * Short of fiddling with the unknown internals of the system's + * printf(3) or completely reimplementing printf(3), i can't think + * of another portable solution. + */ + +#include <stdarg.h> +#include <stdio.h> +#include <stdlib.h> + +int +vasprintf(char **ret, const char *format, va_list ap) +{ + char buf[2]; + va_list ap2; + int sz; + + va_copy(ap2, ap); + sz = vsnprintf(buf, sizeof(buf), format, ap2); + va_end(ap2); + + if (sz != -1 && (*ret = malloc(sz + 1)) != NULL) { + if (vsnprintf(*ret, sz + 1, format, ap) == sz) + return sz; + free(*ret); + } + *ret = NULL; + return -1; +} + +#endif |