diff options
| -rw-r--r-- | src/includes/helpers.h | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/src/includes/helpers.h b/src/includes/helpers.h index 8d8b16e8..3657ee74 100644 --- a/src/includes/helpers.h +++ b/src/includes/helpers.h @@ -53,6 +53,7 @@ } while (/* CONSTCOND */ 0) #endif +#include <stdarg.h> #include <stdbool.h> #include <sys/stat.h> @@ -123,4 +124,52 @@ _unused static bool existss(const char *pathname) return (stat(pathname, &buf) == 0 && buf.st_size != 0); } +/* + * This is an OpenRC specific version of the asprintf() function. + * We do this to avoid defining the _GNU_SOURCE feature test macro on + * glibc systems and to insure that we have a consistent function across + * platforms. This also allows us to call our xmalloc and xrealloc + * functions to handle memory allocation. + * this function was originally written by Mike Frysinger. + */ +_unused static int xasprintf(char **strp, const char *fmt, ...) +{ + va_list ap; + int len; + int memlen; + char *ret; + + /* + * Start with a buffer size that should cover the vast majority of uses + * (path construction). + */ + memlen = 4096; + ret = xmalloc(memlen); + + va_start(ap, fmt); + len = vsnprintf(ret, memlen, fmt, ap); + va_end(ap); + if (len >= memlen) { + /* + * Output was truncated, so increase buffer to exactly what we need. + */ + memlen = len + 1; + ret = xrealloc(ret, memlen); + va_start(ap, fmt); + len = vsnprintf(ret, len + 1, fmt, ap); + va_end(ap); + if (len >= memlen) { + /* Give up! */ + free(ret); + return -1; + } + } + if (len < 0) { + free(ret); + return -1; + } + *strp = ret; + return len; +} + #endif |