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32 lines
634 B
C
32 lines
634 B
C
#define _GNU_SOURCE
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#define __CRT__NO_INLINE
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdarg.h>
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int asprintf(char ** __restrict__ ret,
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const char * __restrict__ format,
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...) {
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va_list ap;
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int len;
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va_start(ap,format);
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/* Get Length */
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len = _vsnprintf(NULL,0,format,ap);
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if (len < 0) goto _end;
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/* +1 for \0 terminator. */
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*ret = malloc(len + 1);
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/* Check malloc fail*/
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if (!*ret) {
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len = -1;
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goto _end;
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}
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/* Write String */
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_vsnprintf(*ret,len+1,format,ap);
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/* Terminate explicitly */
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(*ret)[len] = '\0';
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_end:
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va_end(ap);
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return len;
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}
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