libowfat/scan/scan_charsetnskip.c

#include "scan.h"
#include <ctype.h>

/* Return the number of leading chars in s that are in charset, but no
 * more than limit */
size_t scan_charsetnskip(const char *s,const char *charset,size_t limit) {
  register const char *t=s;
  register const char *u=t+limit;
  register const char* i;
  while (t<u) {
    for (i=charset; *i; ++i)
      if (*i==*t) break;
    if (*i!=*t) break;
    ++t;
  }
  return (size_t)(t-s);
}