From 6203966fbf1f8886ff59cc9d6350b034ee5374c9 Mon Sep 17 00:00:00 2001 From: Lukas Fleischer Date: Mon, 21 Jul 2014 22:44:14 +0200 Subject: Add vasprintf() and asprintf() The new utils.c functions vasprintf() and asprintf() are analogs to sprintf() and vsprintf(). However, instead of requiring a buffer that is large enough to hold the output data, the functions allocate a string and return a pointer to it. Signed-off-by: Lukas Fleischer --- src/utils.c | 38 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 38 insertions(+) (limited to 'src/utils.c') diff --git a/src/utils.c b/src/utils.c index 02839c3..c675518 100644 --- a/src/utils.c +++ b/src/utils.c @@ -1473,3 +1473,41 @@ void print_todo(const char *format, struct todo *todo) } } } + +#define VASPRINTF_INITIAL_BUFSIZE 128 + +int +vasprintf(char **str, const char *format, va_list ap) +{ + va_list ap2; + int n; + + va_copy(ap2, ap); + + *str = mem_malloc(VASPRINTF_INITIAL_BUFSIZE); + n = vsnprintf(*str, VASPRINTF_INITIAL_BUFSIZE, format, ap); + if (n >= VASPRINTF_INITIAL_BUFSIZE) { + *str = mem_realloc(*str, 1, n + 1); + n = vsnprintf(*str, n + 1, format, ap2); + } + + if (n < 0) { + mem_free(*str); + *str = NULL; + } + + return n; +} + +int +asprintf(char **str, const char *format, ...) +{ + va_list ap; + int n; + + va_start(ap, format); + n = vasprintf(str, format, ap); + va_end(ap); + + return n; +} -- cgit v1.2.3-54-g00ecf