#include <string.h>
#include <regex.h>
#include <stdio.h>
#include "locale_impl.h"

/* Error message strings for error codes listed in `regex.h'.  This list
   needs to be in sync with the codes listed there, naturally. */

/* Converted to single string by Rich Felker to remove the need for
 * data relocations at runtime, 27 Feb 2006. */

static const char messages[] = {
    "No error\0"
    "No match\0"
    "Invalid regexp\0"
    "Unknown collating element\0"
    "Unknown character class name\0"
    "Trailing backslash\0"
    "Invalid back reference\0"
    "Missing ']'\0"
    "Missing ')'\0"
    "Missing '}'\0"
    "Invalid contents of {}\0"
    "Invalid character range\0"
    "Out of memory\0"
    "Repetition not preceded by valid expression\0"
    "\0Unknown error"};

size_t regerror(int e,
                const regex_t* restrict preg,
                char* restrict buf,
                size_t size) {
  const char* s;
  for (s = messages; e && *s; e--, s += strlen(s) + 1)
    ;
  if (!*s)
    s++;
  s = LCTRANS_CUR(s);
  return 1 + snprintf(buf, size, "%s", s);
}