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22 lines
792 B
C
22 lines
792 B
C
#include "stralloc.h"
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#include <stdlib.h>
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/* stralloc_ready makes sure that sa has enough space allocated to hold
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* len bytes: If sa is not allocated, stralloc_ready allocates at least
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* len bytes of space, and returns 1. If sa is already allocated, but
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* not enough to hold len bytes, stralloc_ready allocates at least len
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* bytes of space, copies the old string into the new space, frees the
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* old space, and returns 1. Note that this changes sa.s. */
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int stralloc_ready(stralloc *sa,size_t len) {
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register size_t wanted=len+(len>>3)+30; /* heuristic from djb */
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if (wanted<len) wanted=len; // in case of integer overflow
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if (!sa->s || sa->a<len) {
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register char* tmp;
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if (!(tmp=realloc(sa->s,wanted)))
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return 0;
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sa->a=wanted;
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sa->s=tmp;
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}
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return 1;
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}
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