forked from epics_driver_modules/require
63 lines
1.2 KiB
C
63 lines
1.2 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <stdarg.h>
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#include "asprintf.h"
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/* some implementations have __va_copy instead of va_copy */
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#if !defined(va_copy) && defined (__va_copy)
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#define va_copy __va_copy
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#endif
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int vasprintf(char** pbuffer, const char* format, va_list ap)
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{
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int len = -1;
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#ifdef va_copy
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va_list ap2;
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va_copy(ap2, ap);
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#else
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/* if we have no va_copy, we probably don't need one */
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#define ap2 ap
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#endif
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#if defined(vxWorks)
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{
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FILE* f;
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/* print to null device to get required buffer length */
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if ((f = fopen("/null","w")) != NULL)
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{
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len = vfprintf(f, format, ap2);
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fclose(f);
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}
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}
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#elif defined(_WIN32)
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len = _vscprintf(format, ap2);
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#else
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len = vsnprintf(NULL, 0, format, ap2);
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#endif
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#ifdef va_copy
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va_end(ap2);
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#endif
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if (len <= 0)
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{
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fprintf(stderr, "vasprintf: error calculating needed size\n");
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return -1;
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}
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*pbuffer = malloc(len+1);
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if (*pbuffer == NULL) return -1;
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return vsprintf(*pbuffer, format, ap);
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}
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int asprintf(char** pbuffer, const char* 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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len = vasprintf(pbuffer, format, ap);
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va_end(ap);
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return len;
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}
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