busybox/libbb/bb_asprintf.c

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/*
Copyright (C) 2002,2005 Vladimir Oleynik <dzo@simtreas.ru>
*/
#include <stdlib.h>
#include <stdio.h>
#include <stdarg.h>
#include "libbb.h"
char *bb_xasprintf(const char *format, ...)
{
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va_list p;
int r;
char *string_ptr;
#ifdef HAVE_GNU_EXTENSIONS
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va_start(p, format);
r = vasprintf(&string_ptr, format, p);
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va_end(p);
#else
va_start(p, format);
r = vsnprintf(NULL, 0, format, p);
va_end(p);
string_ptr = xmalloc(r+1);
va_start(p, format);
r = vsnprintf(string_ptr, r+1, format, p);
va_end(p);
#endif
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if (r < 0) {
bb_perror_msg_and_die("bb_xasprintf");
}
return string_ptr;
}