| 1 | #include <stdarg.h> |
| 2 | #include <stdio.h> |
| 3 | #include <stdlib.h> |
| 4 | |
| 5 | #include "asprintf.h" |
| 6 | |
| 7 | /** |
| 8 | * asprintf(ret, format, ...): |
| 9 | * Do asprintf(3) like GNU and BSD do. |
| 10 | */ |
| 11 | int |
| 12 | asprintf(char ** ret, const char * format, ...) |
| 13 | { |
| 14 | va_list ap; |
| 15 | int len; |
| 16 | size_t buflen; |
| 17 | |
| 18 | /* Figure out how long the string needs to be. */ |
| 19 | va_start(ap, format); |
| 20 | len = vsnprintf(NULL, 0, format, ap); |
| 21 | va_end(ap); |
| 22 | |
| 23 | /* Did we fail? */ |
| 24 | if (len < 0) |
| 25 | goto err0; |
| 26 | buflen = (size_t)(len) + 1; |
| 27 | |
| 28 | /* Allocate memory. */ |
| 29 | if ((*ret = malloc(buflen)) == NULL) |
| 30 | goto err0; |
| 31 | |
| 32 | /* Actually generate the string. */ |
| 33 | va_start(ap, format); |
| 34 | len = vsnprintf(*ret, buflen, format, ap); |
| 35 | va_end(ap); |
| 36 | |
| 37 | /* Did we fail? */ |
| 38 | if (len < 0) |
| 39 | goto err1; |
| 40 | |
| 41 | /* Success! */ |
| 42 | return (len); |
| 43 | |
| 44 | err1: |
| 45 | free(*ret); |
| 46 | err0: |
| 47 | /* Failure! */ |
| 48 | return (-1); |
| 49 | } |