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/*
* libtextwrap - Text-Wrapping Library with I18N
* Copyright (C) 2003 by Tomohiro KUBOTA <kubota@debian.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of any author may not be used to endorse or promote
* products derived from this software without their specific prior
* written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
*/
#include <stdlib.h>
#include <string.h>
#include <locale.h>
#include <langinfo.h>
#include <ctype.h>
#include <wchar.h>
#include "textwrap.h"
typedef struct {char *buf; int size, len;} string_t;
#define ENCODING_TYPE_SIMPLE 0
#define ENCODING_TYPE_UTF8 1
#define ENCODING_TYPE_CJ 2
/* ---------- internal functions ---------- */
static string_t *
stringt_new(int size)
{
string_t *p;
p = (string_t *)malloc(sizeof(string_t)); if (!p) return NULL;
p->buf = (char *)malloc(size); if (!p->buf) { free(p); return NULL; }
p->size = size;
p->len = 0;
p->buf[0] = 0;
return p;
}
static void
stringt_destroy(string_t *p)
{
free(p->buf);
free(p);
return;
}
static char *
stringt_destroy_extract(string_t *p)
{
char *s = p->buf;
free(p);
return s;
}
static char *
stringt_extract(string_t *p)
{
return p->buf;
}
static void
stringt_zero(string_t *p)
{
p->len = 0;
p->buf[0] = 0;
}
static string_t *
stringt_addstrn(string_t *p, const char *c, int len)
{
if (c == NULL) return p;
if (p->len + len + 1 > p->size) {
p->buf = (char *)realloc(p->buf, (p->size + len + 1) * 2);
if (!p->buf) { free(p); return NULL;}
p->size = (p->size + len + 1) * 2;
}
strncpy(p->buf + p->len, c, len);
p->buf[p->len + len] = 0; p->len += len;
return p;
}
static string_t *
stringt_addstr(string_t *p, const char *c)
{
if (!c) return p;
return stringt_addstrn(p, c, strlen(c));
}
static string_t *
stringt_addstringt(string_t *p, string_t *q)
{
stringt_addstrn(p, q->buf, q->len);
}
/*
* Since the return value of nl_langinfo() may differ depending on
* systems (such as "EUC-JP" vs "eucJP"), the encoding names are
* normalized (all-uppercase, eliminate non-alphanumerics).
*/
static char *
normalize(char *str)
{
char *out, *p, *q;
p = str;
q = out = (char *)malloc(strlen(str) + 1);
while(*p) {
*q = toupper(*p++);
if (isalnum(*q)) q++;
}
*q = 0;
return out;
}
/*
* "Encoding type" affects breakable(). It doesn't affect number of
* bytes of one character nor number of columns of one character.
*/
int
set_encoding_type(const char *encoding)
{
if (!strcmp(encoding, "UTF8")) return ENCODING_TYPE_UTF8;
else if (strstr(encoding, "EUCKR")) return ENCODING_TYPE_SIMPLE;
else if (strstr(encoding, "BIG5")) return ENCODING_TYPE_CJ;
else if (strstr(encoding, "EUC")) return ENCODING_TYPE_CJ;
else if (strstr(encoding, "GB2312")) return ENCODING_TYPE_CJ;
return ENCODING_TYPE_SIMPLE;
}
/*
* "multibyte character" version of wcwidth(3).
*/
static int
mbwidth(const char *ch, int ml)
{
wchar_t c[2];
/* 0x00 - 0x7f is always ASCII */
if ((*ch >= 0 && *ch < 32) || *ch == 127) return -1;
if (*ch >= 0 && *ch < 127) return 1;
if (!mbtowc(c, ch, ml)) return -1;
return wcwidth(c[0]);
}
/*
* returns 1 if the character allows line-breaking after it.
* the character is given in "multibyte character" in C meaning,
* i.e., the encoding specified by LC_CTYPE locale.
*/
static int
breakable(const char *ch, int ml, int encoding_type)
{
unsigned int u;
if (*ch == ' ' || *ch == '\t') return 1;
switch(encoding_type){
case ENCODING_TYPE_SIMPLE: return 0;
case ENCODING_TYPE_CJ: return (ml >= 2);
case ENCODING_TYPE_UTF8:
switch (ml){
case 3: /* U+0800 - U+FFFF */
u = (*ch&0x0f)*0x1000 + (*(ch+1)&0x3f)*0x40 + (*(ch+2)&0x3f);
if (u >= 0x3000 && u <= 0x312f) {
if (u == 0x300a || u == 0x300c || u == 0x300e || u == 0x3010
|| u == 0x3014 || u == 0x3016 || u == 0x3018 || u == 0x301a)
return 0;
return 1;
} /* CJK punctuations, Hiragana, Katakana, Bopomofo */
if (u >= 0x31a0 && u <= 0x31bf) return 1; /* Bopomofo */
if (u >= 0x31f0 && u <= 0x31ff) return 1; /* Katakana extension */
if (u >= 0x3400 && u <= 0x9fff) return 1; /* Han Ideogram */
if (u >= 0xf900 && u <= 0xfaff) return 1; /* Han Ideogram */
return 0;
case 4: /* U+10000 - U+1FFFFF */
u = (*ch&7)*0x40000 + (*(ch+1)&0x3f)*0x1000 + (*(ch+2)&0x3f)*0x40
+ (*(ch+3)&0x3f);
if (u >= 0x20000 && u <= 0x2ffff) return 1; /* Han Ideogram */
return 0;
default: return 0;
}
}
}
/* ---------- public functions ---------- */
void
textwrap_init(textwrap_t *prop)
{
prop->columns = 76;
prop->tab = 8;
prop->head1 = NULL;
prop->head2 = NULL;
}
void
textwrap_columns(textwrap_t *prop, int columns)
{
if (columns > 0) prop->columns = columns;
}
void
textwrap_tab(textwrap_t *prop, int tab)
{
if (tab > 0) prop->tab = tab;
}
void
textwrap_head(textwrap_t *prop, const char *head1, const char *head2)
{
prop->head1 = head1;
prop->head2 = head2;
}
char *
textwrap(const textwrap_t *prop, const char *text)
{
int len;
string_t *out, *word;
int additional;
const char *p;
int line_width, word_width;
int head1_width, head2_width;
char *encoding;
int encoding_type;
int columns, tab;
const char *head1, *head2;
columns = prop->columns; tab = prop->tab;
head1 = prop->head1; head2 = prop->head2;
/* locale initialization */
encoding = normalize(nl_langinfo(CODESET));
encoding_type = set_encoding_type(encoding);
/* buffer initialization */
len = strlen(text);
additional = len / columns + columns;
out = stringt_new(len + additional);
word = stringt_new(len);
/* header initialization */
if (head1 != NULL) {
for (p = head1, head1_width = 0; *p;) {
int l = mblen(p, MB_CUR_MAX);
if (l < 0) {head1 = NULL; head1_width = 0; break;}
head1_width += mbwidth(p, l); p += l;
}
if (head1_width >= columns) {head1 = NULL; head1_width = 0;}
} else head1_width = 0;
if (head2 != NULL) {
for (p = head2, head2_width = 0; *p;) {
int l = mblen(p, MB_CUR_MAX);
if (l < 0) {head2 = NULL; head2_width = 0; break;}
head2_width += mbwidth(p, l); p += l;
}
if (head2_width >= columns) {head2 = NULL; head2_width = 0;}
} else head2_width = 0;
/* preparation for the main loop */
p = text; /* next input character */
stringt_addstr(out, head1);
line_width = head1_width;
word_width = 0;
/* main loop */
while(1){
int ml, w, b;
const char *now;
if (!*p) {
stringt_addstringt(out, word);
return stringt_destroy_extract(out);
}
now = p; /* current character */
ml = mblen(p, MB_CUR_MAX);
if (ml<0) {
/*
* stringt_addstr will take care about enough
* memory for out
*/
stringt_addstr(out, " <ERR>");
return stringt_destroy_extract(out);
}
w = mbwidth(p, ml);
b = breakable(p, ml, encoding_type);
p += ml;
/*
* newline code
*/
if (*now == '\n') {
stringt_addstringt(out, word);
stringt_addstr(out, "\n");
if (!*p) return stringt_destroy_extract(out);
stringt_addstr(out, head2); line_width = head2_width;
stringt_zero(word); word_width = 0;
continue;
}
/*
* tab code
*/
if (*now == '\t') {
if (line_width + word_width >= (columns / tab) * tab) {
/* new line */
stringt_addstringt(out, word);
stringt_addstr(out, "\n");
if (!*p) return stringt_destroy_extract(out);
stringt_addstr(out, head2); line_width = head2_width;
stringt_zero(word); word_width = 0;
} else {
/* not new line */
int j;
stringt_addstringt(out, word); line_width += word_width;
stringt_zero(word); word_width = 0;
j = tab - (line_width + word_width) % tab;
for( ; j; j--) { stringt_addstr(out, " "); line_width ++; }
}
continue;
}
if (w < 0 || (*now >= 0 && *now < 0x20)) continue;
/*
* when the current line have enough room for the current character
*/
if (line_width + word_width + w <= columns) {
if (*now == ' ' || b) {
stringt_addstringt(out, word);
stringt_addstrn(out, now, ml);
line_width += word_width + w;
stringt_zero(word); word_width = 0;
} else {
stringt_addstrn(word, now, ml); word_width += w;
}
continue;
}
/*
* when the current line overflows with the current character
*/
if (*now == ' ') {
stringt_addstringt(out, word);
stringt_addstr(out, "\n");
stringt_addstr(out, head2); line_width = head2_width;
stringt_zero(word); word_width = 0;
} else if (word_width + w <= columns) {
stringt_addstr(out, "\n");
stringt_addstr(out, head2); line_width = head2_width;
p = now;
} else {
stringt_addstringt(out, word);
stringt_addstr(out, "\n");
stringt_addstr(out, head2); line_width = head2_width;
stringt_zero(word);
stringt_addstrn(word, now, ml); word_width = w;
}
}
}
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