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30 lines
693 B
C
30 lines
693 B
C
#include "scan.h"
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#include <ctype.h>
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/* Return the number of leading chars in s that are in charset, but no
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* more than limit */
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size_t scan_charsetnskip(const char *s,const char *charset,size_t limit) {
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register const char *t=s;
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register const char *u=t+limit;
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register const char* i;
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while (t<u) {
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for (i=charset; *i; ++i)
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if (*i==*t) break;
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if (*i!=*t) break;
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++t;
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}
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return (size_t)(t-s);
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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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assert(scan_charsetnskip("fnord","fo",4)==1);
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assert(scan_charsetnskip("fnord","nf",4)==2);
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assert(scan_charsetnskip("gaord","nf",4)==0);
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assert(scan_charsetnskip("fnord","fnord",4)==4);
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return 0;
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}
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#endif
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