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25 lines
558 B
C
25 lines
558 B
C
4 years ago
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#include <byte.h>
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#undef byte_starts
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#include <string.h>
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int byte_starts(const void* a,size_t alen,const char* s) {
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size_t i;
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for (i=0; i<alen; ++i) {
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if (s[i]==0) return 1;
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if (((const char*)a)[i] != s[i]) return 0;
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}
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return s[i]==0;
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}
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#ifdef UNITTEST
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#include <assert.h>
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int main() {
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static char buf[]="The quick brown fox jumps over the lazy dog";
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assert(byte_starts(buf,sizeof(buf)-1,"The "));
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assert(!byte_starts(buf,sizeof(buf)-1,"the "));
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assert(!byte_starts(buf,2,"The "));
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assert(byte_starts("The ",4,"The "));
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}
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#endif
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