forked from epics_driver_modules/require
48 lines
971 B
C
48 lines
971 B
C
#include <stdio.h>
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#include <stdlib.h>
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#include "asprintf.h"
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#ifndef 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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va_list ap2;
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size_t len;
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#if defined(vxWorks)
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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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#elif defined(_WIN32)
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len = _vscprintf(format, ap);
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#else
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len = vsnprintf(NULL, 0, format, ap);
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#endif
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va_end(ap2);
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if (len <= 0)
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{
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fprintf(stderr, "vasprintf: too old version on vsnprintf\n");
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return len;
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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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