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/*
* isutf8.c - do the input files look like valid utf-8 byte streams?
*
* Copyright (C) 2005 Lars Wirzenius
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <getopt.h>
#define VERSION "1.0"
/*
* I'm pretty sure there is a fancy trick to do this without a loop,
* but I'm too tired to figure it out now. --liw
*/
static int high_ones(int c)
{
int n;
for (n = 0; (c & 0x80) == 0x80; c <<= 1)
++n;
return n;
}
static int is_utf8_byte_stream(FILE *file, char *filename, int quiet)
{
int c, n, remaining_bytes;
unsigned long line, col;
remaining_bytes = 0;
line = 1;
col = 1;
while ((c = getc(file)) != EOF) {
n = high_ones(c);
if (remaining_bytes > 0) {
if (n == 1) {
--remaining_bytes;
if (remaining_bytes == 0)
++col;
} else
goto error;
} else if (n == 0) {
/* 7-bit character, skip, but adjust position */
if (c == '\n') {
++line;
col = 1;
} else
++col;
} else if (n == 1)
goto error; /* wrong place for continuation byte */
else
remaining_bytes = n - 1; /* start of multi-byte sequence */
}
if (remaining_bytes > 0)
goto error;
return 1;
error:
if (!quiet) {
printf("%s: line %lu, col %lu: invalid UTF-8 code\n",
filename, line, col);
}
return 0;
}
static void usage(const char *program_name)
{
printf("Usage: %s [-hq] [--help] [--quiet] [file ...]\n", program_name);
printf("Check whether input files are valid UTF-8.\n");
printf("This is version %s.\n", VERSION);
}
int main(int argc, char **argv)
{
int i, ok;
FILE *file;
int quiet;
struct option options[] = {
{ "help", no_argument, NULL, 'h' },
{ "quiet", no_argument, &quiet, 1 },
};
int opt;
quiet = 0;
while ((opt = getopt_long(argc, argv, "hq", options, NULL)) != -1) {
switch (opt) {
case 0:
break;
case 'h':
usage(argv[0]);
exit(0);
break;
case 'q':
quiet = 1;
break;
case '?':
exit(EXIT_FAILURE);
default:
abort();
}
}
if (optind == argc)
ok = is_utf8_byte_stream(stdin, "stdin", quiet);
else {
ok = 1;
for (i = optind; i < argc; ++i) {
file = fopen(argv[i], "r");
if (file == NULL) {
fprintf(stderr, "isutf8: %s: error %d: %s\n",
argv[i], errno, strerror(errno));
ok = 0;
} else {
ok = is_utf8_byte_stream(file, argv[i], quiet) && ok;
(void) fclose(file);
}
}
}
if (ok)
exit(0);
exit(EXIT_FAILURE);
}
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