thodg/got/lib/utf8.c

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  Commit

• Author : Stefan Sperling
  Date : 2019-05-13 12:40:57
  Hash : 638f9024
  Message : rename got_error_prefix_errno() to got_error_from_errno()

• lib/utf8.c

• /*
   * Copyright (c) 2015 Ingo Schwarze <schwarze@openbsd.org>
   * Copyright (c) 2018 Stefan Sperling <stsp@openbsd.org>
   *
   * Permission to use, copy, modify, and distribute this software for any
   * purpose with or without fee is hereby granted, provided that the above
   * copyright notice and this permission notice appear in all copies.
   *
   * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
   * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
   * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
   * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
   * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
   * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
   */
  
  #include <err.h>
  #include <stdlib.h>
  #include <string.h>
  #include <wchar.h>
  #include <langinfo.h>
  
  #include "got_error.h"
  #include "got_utf8.h"
  
  const struct got_error *
  got_mbsavis(char** outp, int *widthp, const char *mbs)
  {
  	const char *src;  /* Iterate mbs. */
  	char	 *dst;  /* Iterate *outp. */
  	wchar_t	  wc;
  	int	  total_width;  /* Display width of the whole string. */
  	int	  width;  /* Display width of a single Unicode char. */
  	int	  len;  /* Length in bytes of UTF-8 encoded string. */
  
  	len = strlen(mbs);
  	if ((*outp = malloc(len + 1)) == NULL)
  		return got_error_from_errno("malloc");
  
  	if (MB_CUR_MAX == 1) {
  		memcpy(*outp, mbs, len + 1);
  		*widthp = len;
  		return NULL;
  	}
  
  	src = mbs;
  	dst = *outp;
  	total_width = 0;
  	while (*src != '\0') {
  		if ((len = mbtowc(&wc, src, MB_CUR_MAX)) == -1) {
  			total_width++;
  			*dst++ = '?';
  			src++;
  		} else if ((width = wcwidth(wc)) == -1) {
  			total_width++;
  			*dst++ = '?';
  			src += len;
  		} else {
  			total_width += width;
  			while (len-- > 0)
  				*dst++ = *src++;
  		}
  	}
  	*dst = '\0';
  	*widthp = total_width;
  	return NULL;
  }
  
  int
  got_locale_is_utf8(void)
  {
  	char *codeset = nl_langinfo(CODESET);
  	return (strcmp(codeset, "UTF-8") == 0);
  }