strcount.c
1.32 KB
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/* GNU Mailutils -- a suite of utilities for electronic mail
Copyright (C) 2016 Free Software Foundation, Inc.
GNU Mailutils 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 3, or (at your option)
any later version.
GNU Mailutils 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 GNU Mailutils. If not, see <http://www.gnu.org/licenses/>. */
#include <config.h>
#include <limits.h>
#include <mailutils/util.h>
/* Return the number of occurrences of the ASCII character CHR in the
UTF-8 string STR. */
size_t
mu_str_count (char const *str, int chr)
{
unsigned char c;
size_t count = 0;
int consume = 0;
if (!str || chr < 0 || chr > UCHAR_MAX)
return 0;
while ((c = *str++) != 0)
{
if (consume)
consume--;
else if (c < 0xc0)
{
if (c == chr)
count++;
}
else if (c & 0xc0)
consume = 1;
else if (c & 0xe0)
consume = 2;
else if (c & 0xf0)
consume = 3;
}
return count;
}