kernel/vsprintf.c


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#include <stdarg.h>

int vsprintf(char *str, char *fmt, va_list ap) {
  char *start = str;

  while(*fmt) {
    if(*fmt != '%') {
      *str++ = *fmt++;
      continue;
    }

    fmt++;
  }

  *str = 0;

  return (str - start);
}