49 lines
1.0 KiB
C
49 lines
1.0 KiB
C
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#include <asn_internal.h>
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ssize_t
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asn__format_to_callback(int (*cb)(const void *, size_t, void *key), void *key,
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const char *fmt, ...) {
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char scratch[64];
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char *buf = scratch;
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size_t buf_size = sizeof(scratch);
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int wrote;
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int cb_ret;
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do {
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va_list args;
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va_start(args, fmt);
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wrote = vsnprintf(buf, buf_size, fmt, args);
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if(wrote < (ssize_t)buf_size) {
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if(wrote < 0) {
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if(buf != scratch) FREEMEM(buf);
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va_end(args);
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return -1;
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}
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break;
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}
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buf_size <<= 1;
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if(buf == scratch) {
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buf = MALLOC(buf_size);
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if(!buf) return -1;
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} else {
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void *p = REALLOC(buf, buf_size);
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if(!p) {
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FREEMEM(buf);
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return -1;
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}
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buf = p;
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}
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} while(1);
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cb_ret = cb(buf, wrote, key);
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if(buf != scratch) FREEMEM(buf);
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if(cb_ret < 0) {
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return -1;
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}
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return wrote;
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}
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