[sgt/halibut] / ustring.c

/*
 * ustring.c: Unicode string routines
 */

#include <wchar.h>
#include <stdlib.h>
#include <assert.h>
#include <time.h>
#include "halibut.h"

wchar_t *ustrdup(wchar_t const *s) {
    wchar_t *r;
    if (s) {
	r = mknewa(wchar_t, 1+ustrlen(s));
	ustrcpy(r, s);
    } else {
	r = mknew(wchar_t);
	*r = 0;
    }
    return r;
}

static char *ustrtoa_internal(wchar_t const *s, char *outbuf, int size,
			      int charset, int careful) {
    int len, ret, err;
    charset_state state = CHARSET_INIT_STATE;

    if (!s) {
	*outbuf = '\0';
	return outbuf;
    }

    len = ustrlen(s);
    size--;			       /* leave room for terminating NUL */
    *outbuf = '\0';
    while (len > 0) {
	err = 0;
	ret = charset_from_unicode(&s, &len, outbuf, size, charset, &state,
				   (careful ? &err : NULL));
	if (err)
	    return NULL;
	if (!ret)
	    return outbuf;
	size -= ret;
	outbuf += ret;
	*outbuf = '\0';
    }
    /*
     * Clean up
     */
    ret = charset_from_unicode(NULL, 0, outbuf, size, charset, &state, NULL);
    size -= ret;
    outbuf += ret;
    *outbuf = '\0';
    return outbuf;
}

char *ustrtoa(wchar_t const *s, char *outbuf, int size, int charset) {
    return ustrtoa_internal(s, outbuf, size, charset, FALSE);
}

char *ustrtoa_careful(wchar_t const *s, char *outbuf, int size, int charset) {
    return ustrtoa_internal(s, outbuf, size, charset, TRUE);
}

wchar_t *ustrfroma(char const *s, wchar_t *outbuf, int size, int charset) {
    int len, ret;
    charset_state state = CHARSET_INIT_STATE;

    if (!s) {
	*outbuf = L'\0';
	return outbuf;
    }

    len = strlen(s);
    size--;			       /* allow for terminating NUL */
    *outbuf = L'\0';
    while (len > 0) {
	ret = charset_to_unicode(&s, &len, outbuf, size,
				 charset, &state, NULL, 0);
	if (!ret)
	    return outbuf;
	outbuf += ret;
	size -= ret;
	*outbuf = L'\0';
    }
    return outbuf;
}

char *utoa_internal_dup(wchar_t const *s, int charset, int *lenp, int careful)
{
    char *outbuf;
    int outpos, outlen, len, ret, err;
    charset_state state = CHARSET_INIT_STATE;

    if (!s) {
	return dupstr("");
    }

    len = ustrlen(s);

    outlen = len + 10;
    outbuf = mknewa(char, outlen);

    outpos = 0;
    outbuf[outpos] = '\0';

    while (len > 0) {
	err = 0;
	ret = charset_from_unicode(&s, &len,
				   outbuf + outpos, outlen - outpos - 1,
				   charset, &state, (careful ? &err : NULL));
	if (err) {
	    sfree(outbuf);
	    return NULL;
	}
	if (!ret) {
	    outlen = outlen * 3 / 2;
	    outbuf = resize(outbuf, outlen);
	}
	outpos += ret;
	outbuf[outpos] = '\0';
    }
    /*
     * Clean up
     */
    outlen = outpos + 32;
    outbuf = resize(outbuf, outlen);
    ret = charset_from_unicode(NULL, 0,
			       outbuf + outpos, outlen - outpos + 1,
			       charset, &state, NULL);
    outpos += ret;
    outbuf[outpos] = '\0';
    if (lenp)
	*lenp = outpos;
    return outbuf;
}

char *utoa_dup(wchar_t const *s, int charset)
{
    return utoa_internal_dup(s, charset, NULL, FALSE);
}

char *utoa_dup_len(wchar_t const *s, int charset, int *len)
{
    return utoa_internal_dup(s, charset, len, FALSE);
}

char *utoa_careful_dup(wchar_t const *s, int charset)
{
    return utoa_internal_dup(s, charset, NULL, TRUE);
}

wchar_t *ufroma_dup(char const *s, int charset) {
    int len;
    wchar_t *buf = NULL;

    len = strlen(s) + 1;
    do {
	buf = resize(buf, len);
	ustrfroma(s, buf, len, charset);
	len = (3 * len) / 2 + 1;       /* this guarantees a strict increase */
    } while (ustrlen(buf) >= len-1);

    buf = resize(buf, ustrlen(buf)+1);
    return buf;
}

char *utoa_locale_dup(wchar_t const *s)
{
    /*
     * This variant uses the C library locale.
     */
    char *ret;
    int len;
    size_t siz;

    len = ustrlen(s);

    ret = mknewa(char, 1 + MB_CUR_MAX * len);

    siz = wcstombs(ret, s, len);

    if (siz) {
	assert(siz <= MB_CUR_MAX * len);
	ret[siz] = '\0';
	ret = resize(ret, siz+1);
	return ret;
    }

    /*
     * If that failed, try a different strategy (which we will also
     * attempt in the total absence of wcstombs). Retrieve the
     * locale's charset from nl_langinfo or equivalent, and use
     * normal utoa_dup.
     */
    return utoa_dup(s, charset_from_locale());
}

wchar_t *ufroma_locale_dup(char const *s)
{
    /*
     * This variant uses the C library locale.
     */
    wchar_t *ret;
    int len;
    size_t siz;

    len = strlen(s);

    ret = mknewa(wchar_t, 1 + 2*len);  /* be conservative */

    siz = mbstowcs(ret, s, len);

    if (siz) {
	assert(siz <= (size_t)(2 * len));
	ret[siz] = L'\0';
	ret = resize(ret, siz+1);
	return ret;
    }

    /*
     * If that failed, try a different strategy (which we will also
     * attempt in the total absence of wcstombs). Retrieve the
     * locale's charset from nl_langinfo or equivalent, and use
     * normal ufroma_dup.
     */
    return ufroma_dup(s, charset_from_locale());
}

int ustrlen(wchar_t const *s) {
    int len = 0;
    while (*s++) len++;
    return len;
}

wchar_t *uadv(wchar_t *s) {
    return s + 1 + ustrlen(s);
}

wchar_t *ustrcpy(wchar_t *dest, wchar_t const *source) {
    wchar_t *ret = dest;
    do {
	*dest++ = *source;
    } while (*source++);
    return ret;
}

int ustrcmp(wchar_t *lhs, wchar_t *rhs) {
    if (!lhs && !rhs) return 0;
    if (!lhs) return -1;
    if (!rhs) return +1;
    while (*lhs && *rhs && *lhs==*rhs)
	lhs++, rhs++;
    if (*lhs < *rhs)
	return -1;
    else if (*lhs > *rhs)
	return 1;
    return 0;
}

wchar_t utolower(wchar_t c) {
    if (c == L'\0')
	return c;		       /* this property needed by ustricmp */
#ifdef HAS_TOWLOWER
    return towlower(c);
#else
    if (c >= 'A' && c <= 'Z')
	c += 'a'-'A';
    return c;
#endif
}

int uisalpha(wchar_t c) {
#ifdef HAS_ISWALPHA
    return iswalpha(c);
#else
    return (c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z');
#endif
}

int ustricmp(wchar_t *lhs, wchar_t *rhs) {
    wchar_t lc, rc;
    while ((lc = utolower(*lhs)) == (rc = utolower(*rhs)) && lc && rc)
	lhs++, rhs++;
    if (!lc && !rc)
	return 0;
    if (lc < rc)
	return -1;
    else
	return 1;
}

wchar_t *ustrlow(wchar_t *s) {
    wchar_t *p = s;
    while (*p) {
	*p = utolower(*p);
	p++;
    }
    return s;
}

int utoi(wchar_t *s) {
    int sign = +1;
    int n;

    if (*s == L'-') {
	s++;
	sign = -1;
    }

    n = 0;
    while (*s && *s >= L'0' && *s <= L'9') {
	n *= 10;
	n += (*s - '0');
	s++;
    }

    return n;
}

int utob(wchar_t *s) {
    if (!ustricmp(s, L"yes") || !ustricmp(s, L"y") ||
	!ustricmp(s, L"true") || !ustricmp(s, L"t"))
	return TRUE;
    return FALSE;
}

int uisdigit(wchar_t c) {
    return c >= L'0' && c <= L'9';
}

#define USTRFTIME_DELTA 128
wchar_t *ustrftime(wchar_t *wfmt, struct tm *timespec) {
    void *blk = NULL;
    wchar_t *wblk, *wp;
    char *fmt, *text, *p;
    size_t size = 0;
    size_t len;

    /*
     * FIXME: really we ought to copy non-% parts of the format
     * ourselves, and only resort to strftime for % parts. Also we
     * should use wcsftime if it's present.
     */

    /*
     * strftime has the entertaining property that it returns 0
     * _either_ on out-of-space _or_ on successful generation of
     * the empty string. Hence we must ensure our format can never
     * generate the empty string. Somebody throw a custard pie at
     * whoever was responsible for that. Please?
     */
    if (wfmt) {
	len = ustrlen(wfmt);
	fmt = mknewa(char, 2+len);
	ustrtoa(wfmt, fmt+1, len+1, CS_ASCII);   /* CS_FIXME? */
	fmt[0] = ' ';
    } else
	fmt = " %c";

    while (1) {
	size += USTRFTIME_DELTA;
	blk = resize((char *)blk, size);
	len = strftime((char *)blk, size-1, fmt, timespec);
	if (len > 0)
	    break;
    }

    /* Note: +1 for the terminating 0, -1 for the initial space in fmt */
    wblk = resize((wchar_t *)blk, len);
    text = mknewa(char, len);
    strftime(text, len, fmt+1, timespec);
    /*
     * We operate in the C locale, so this all ought to be kosher
     * ASCII. If we ever move outside ASCII machines, we may need
     * to make this more portable...
     */
    for (wp = wblk, p = text; *p; p++, wp++)
	*wp = *p;
    *wp = 0;
    if (wfmt)
	sfree(fmt);
    sfree(text);
    return wblk;
}

/*
 * Determine whether a Unicode string can be translated into a
 * given charset without any missing characters.
 */
int cvt_ok(int charset, const wchar_t *s)
{
    char buf[256];
    charset_state state = CHARSET_INIT_STATE;
    int err, len = ustrlen(s);

    err = 0;
    while (len > 0) {
	(void)charset_from_unicode(&s, &len, buf, lenof(buf),
				   charset, &state, &err);
	if (err)
	    return FALSE;
    }
    return TRUE;
}
Commit	Line	Data
d7482997	1	/*
	2	* ustring.c: Unicode string routines
	3	*/
	4
	5	#include <wchar.h>
7e976207	6	#include <stdlib.h>
7e976207	7	#include <assert.h>
d7482997	8	#include <time.h>
	9	#include "halibut.h"
	10
e4ea58f8	11	wchar_t ustrdup(wchar_t const s) {
d7482997	12	wchar_t *r;
	13	if (s) {
	14	r = mknewa(wchar_t, 1+ustrlen(s));
	15	ustrcpy(r, s);
	16	} else {
	17	r = mknew(wchar_t);
	18	*r = 0;
	19	}
	20	return r;
	21	}
	22
e4ea58f8	23	static char ustrtoa_internal(wchar_t const s, char *outbuf, int size,
	24	int charset, int careful) {
	25	int len, ret, err;
	26	charset_state state = CHARSET_INIT_STATE;
	27
d7482997	28	if (!s) {
	29	*outbuf = '\0';
	30	return outbuf;
	31	}
e4ea58f8	32
	33	len = ustrlen(s);
	34	size--; /* leave room for terminating NUL */
	35	*outbuf = '\0';
	36	while (len > 0) {
	37	err = 0;
	38	ret = charset_from_unicode(&s, &len, outbuf, size, charset, &state,
	39	(careful ? &err : NULL));
	40	if (err)
	41	return NULL;
	42	if (!ret)
	43	return outbuf;
	44	size -= ret;
	45	outbuf += ret;
	46	*outbuf = '\0';
	47	}
	48	/*
	49	* Clean up
	50	*/
	51	ret = charset_from_unicode(NULL, 0, outbuf, size, charset, &state, NULL);
	52	size -= ret;
	53	outbuf += ret;
	54	*outbuf = '\0';
d7482997	55	return outbuf;
	56	}
	57
e4ea58f8	58	char ustrtoa(wchar_t const s, char *outbuf, int size, int charset) {
	59	return ustrtoa_internal(s, outbuf, size, charset, FALSE);
	60	}
	61
	62	char ustrtoa_careful(wchar_t const s, char *outbuf, int size, int charset) {
	63	return ustrtoa_internal(s, outbuf, size, charset, TRUE);
	64	}
	65
	66	wchar_t ustrfroma(char const s, wchar_t *outbuf, int size, int charset) {
	67	int len, ret;
	68	charset_state state = CHARSET_INIT_STATE;
	69
ba9c1487	70	if (!s) {
	71	*outbuf = L'\0';
	72	return outbuf;
	73	}
e4ea58f8	74
	75	len = strlen(s);
	76	size--; /* allow for terminating NUL */
	77	*outbuf = L'\0';
	78	while (len > 0) {
	79	ret = charset_to_unicode(&s, &len, outbuf, size,
	80	charset, &state, NULL, 0);
	81	if (!ret)
	82	return outbuf;
	83	outbuf += ret;
	84	size -= ret;
	85	*outbuf = L'\0';
	86	}
ba9c1487	87	return outbuf;
	88	}
	89
e4ea58f8	90	char utoa_internal_dup(wchar_t const s, int charset, int *lenp, int careful)
	91	{
	92	char *outbuf;
	93	int outpos, outlen, len, ret, err;
	94	charset_state state = CHARSET_INIT_STATE;
50d6b4bd	95
e4ea58f8	96	if (!s) {
	97	return dupstr("");
	98	}
50d6b4bd	99
e4ea58f8	100	len = ustrlen(s);
	101
	102	outlen = len + 10;
	103	outbuf = mknewa(char, outlen);
	104
	105	outpos = 0;
	106	outbuf[outpos] = '\0';
	107
	108	while (len > 0) {
	109	err = 0;
	110	ret = charset_from_unicode(&s, &len,
	111	outbuf + outpos, outlen - outpos - 1,
	112	charset, &state, (careful ? &err : NULL));
	113	if (err) {
	114	sfree(outbuf);
	115	return NULL;
	116	}
	117	if (!ret) {
	118	outlen = outlen * 3 / 2;
	119	outbuf = resize(outbuf, outlen);
	120	}
	121	outpos += ret;
	122	outbuf[outpos] = '\0';
	123	}
	124	/*
	125	* Clean up
	126	*/
	127	outlen = outpos + 32;
	128	outbuf = resize(outbuf, outlen);
	129	ret = charset_from_unicode(NULL, 0,
	130	outbuf + outpos, outlen - outpos + 1,
	131	charset, &state, NULL);
	132	outpos += ret;
	133	outbuf[outpos] = '\0';
	134	if (lenp)
	135	*lenp = outpos;
	136	return outbuf;
50d6b4bd	137	}
50d6b4bd	138
e4ea58f8	139	char utoa_dup(wchar_t const s, int charset)
	140	{
	141	return utoa_internal_dup(s, charset, NULL, FALSE);
	142	}
	143
	144	char utoa_dup_len(wchar_t const s, int charset, int *len)
	145	{
	146	return utoa_internal_dup(s, charset, len, FALSE);
	147	}
	148
	149	char utoa_careful_dup(wchar_t const s, int charset)
	150	{
	151	return utoa_internal_dup(s, charset, NULL, TRUE);
	152	}
	153
	154	wchar_t ufroma_dup(char const s, int charset) {
ba9c1487	155	int len;
	156	wchar_t *buf = NULL;
	157
	158	len = strlen(s) + 1;
	159	do {
	160	buf = resize(buf, len);
e4ea58f8	161	ustrfroma(s, buf, len, charset);
ba9c1487	162	len = (3 * len) / 2 + 1; /* this guarantees a strict increase */
	163	} while (ustrlen(buf) >= len-1);
	164
	165	buf = resize(buf, ustrlen(buf)+1);
	166	return buf;
	167	}
	168
7e976207	169	char utoa_locale_dup(wchar_t const s)
	170	{
	171	/*
	172	* This variant uses the C library locale.
	173	*/
	174	char *ret;
	175	int len;
	176	size_t siz;
	177
	178	len = ustrlen(s);
	179
	180	ret = mknewa(char, 1 + MB_CUR_MAX * len);
	181
	182	siz = wcstombs(ret, s, len);
	183
	184	if (siz) {
	185	assert(siz <= MB_CUR_MAX * len);
	186	ret[siz] = '\0';
	187	ret = resize(ret, siz+1);
	188	return ret;
	189	}
	190
	191	/*
	192	* If that failed, try a different strategy (which we will also
	193	* attempt in the total absence of wcstombs). Retrieve the
	194	* locale's charset from nl_langinfo or equivalent, and use
	195	* normal utoa_dup.
	196	*/
	197	return utoa_dup(s, charset_from_locale());
	198	}
	199
	200	wchar_t ufroma_locale_dup(char const s)
	201	{
	202	/*
	203	* This variant uses the C library locale.
	204	*/
	205	wchar_t *ret;
	206	int len;
	207	size_t siz;
	208
	209	len = strlen(s);
	210
	211	ret = mknewa(wchar_t, 1 + 2len); / be conservative */
	212
	213	siz = mbstowcs(ret, s, len);
	214
	215	if (siz) {
	216	assert(siz <= (size_t)(2 * len));
	217	ret[siz] = L'\0';
	218	ret = resize(ret, siz+1);
	219	return ret;
	220	}
	221
	222	/*
	223	* If that failed, try a different strategy (which we will also
	224	* attempt in the total absence of wcstombs). Retrieve the
	225	* locale's charset from nl_langinfo or equivalent, and use
	226	* normal ufroma_dup.
	227	*/
	228	return ufroma_dup(s, charset_from_locale());
	229	}
	230
5dd44dce	231	int ustrlen(wchar_t const *s) {
d7482997	232	int len = 0;
	233	while (*s++) len++;
	234	return len;
	235	}
	236
	237	wchar_t uadv(wchar_t s) {
	238	return s + 1 + ustrlen(s);
	239	}
	240
5dd44dce	241	wchar_t ustrcpy(wchar_t dest, wchar_t const *source) {
d7482997	242	wchar_t *ret = dest;
	243	do {
	244	dest++ = source;
	245	} while (*source++);
	246	return ret;
	247	}
	248
	249	int ustrcmp(wchar_t lhs, wchar_t rhs) {
	250	if (!lhs && !rhs) return 0;
	251	if (!lhs) return -1;
	252	if (!rhs) return +1;
	253	while (lhs && rhs && lhs==rhs)
	254	lhs++, rhs++;
	255	if (lhs < rhs)
	256	return -1;
	257	else if (lhs > rhs)
	258	return 1;
	259	return 0;
	260	}
	261
	262	wchar_t utolower(wchar_t c) {
	263	if (c == L'\0')
	264	return c; /* this property needed by ustricmp */
9badd775	265	#ifdef HAS_TOWLOWER
	266	return towlower(c);
	267	#else
d7482997	268	if (c >= 'A' && c <= 'Z')
	269	c += 'a'-'A';
	270	return c;
9badd775	271	#endif
d7482997	272	}
d7482997	273
831da32e	274	int uisalpha(wchar_t c) {
9badd775	275	#ifdef HAS_ISWALPHA
	276	return iswalpha(c);
	277	#else
831da32e	278	return (c >= 'A' && c <= 'Z') \|\| (c >= 'a' && c <= 'z');
9badd775	279	#endif
831da32e	280	}
831da32e	281
d7482997	282	int ustricmp(wchar_t lhs, wchar_t rhs) {
	283	wchar_t lc, rc;
	284	while ((lc = utolower(lhs)) == (rc = utolower(rhs)) && lc && rc)
	285	lhs++, rhs++;
	286	if (!lc && !rc)
	287	return 0;
	288	if (lc < rc)
	289	return -1;
	290	else
	291	return 1;
	292	}
	293
	294	wchar_t ustrlow(wchar_t s) {
	295	wchar_t *p = s;
	296	while (*p) {
	297	p = utolower(p);
	298	p++;
	299	}
	300	return s;
	301	}
	302
	303	int utoi(wchar_t *s) {
	304	int sign = +1;
	305	int n;
	306
	307	if (*s == L'-') {
	308	s++;
	309	sign = -1;
	310	}
	311
	312	n = 0;
	313	while (s && s >= L'0' && *s <= L'9') {
	314	n *= 10;
	315	n += (*s - '0');
	316	s++;
	317	}
	318
	319	return n;
	320	}
	321
	322	int utob(wchar_t *s) {
	323	if (!ustricmp(s, L"yes") \|\| !ustricmp(s, L"y") \|\|
	324	!ustricmp(s, L"true") \|\| !ustricmp(s, L"t"))
	325	return TRUE;
	326	return FALSE;
	327	}
	328
	329	int uisdigit(wchar_t c) {
	330	return c >= L'0' && c <= L'9';
	331	}
	332
	333	#define USTRFTIME_DELTA 128
	334	wchar_t ustrftime(wchar_t wfmt, struct tm *timespec) {
	335	void *blk = NULL;
	336	wchar_t wblk, wp;
	337	char fmt, text, *p;
	338	size_t size = 0;
	339	size_t len;
	340
	341	/*
e4ea58f8	342	* FIXME: really we ought to copy non-% parts of the format
	343	* ourselves, and only resort to strftime for % parts. Also we
	344	* should use wcsftime if it's present.
	345	*/
	346
	347	/*
d7482997	348	* strftime has the entertaining property that it returns 0
	349	* _either_ on out-of-space _or_ on successful generation of
	350	* the empty string. Hence we must ensure our format can never
	351	* generate the empty string. Somebody throw a custard pie at
	352	* whoever was responsible for that. Please?
	353	*/
	354	if (wfmt) {
	355	len = ustrlen(wfmt);
	356	fmt = mknewa(char, 2+len);
e4ea58f8	357	ustrtoa(wfmt, fmt+1, len+1, CS_ASCII); /* CS_FIXME? */
d7482997	358	fmt[0] = ' ';
	359	} else
	360	fmt = " %c";
	361
	362	while (1) {
	363	size += USTRFTIME_DELTA;
	364	blk = resize((char *)blk, size);
	365	len = strftime((char *)blk, size-1, fmt, timespec);
	366	if (len > 0)
	367	break;
	368	}
	369
	370	/* Note: +1 for the terminating 0, -1 for the initial space in fmt */
	371	wblk = resize((wchar_t *)blk, len);
	372	text = mknewa(char, len);
	373	strftime(text, len, fmt+1, timespec);
	374	/*
	375	* We operate in the C locale, so this all ought to be kosher
	376	* ASCII. If we ever move outside ASCII machines, we may need
	377	* to make this more portable...
	378	*/
	379	for (wp = wblk, p = text; *p; p++, wp++)
	380	wp = p;
	381	*wp = 0;
	382	if (wfmt)
	383	sfree(fmt);
	384	sfree(text);
	385	return wblk;
	386	}
91f93b94	387
	388	/*
	389	* Determine whether a Unicode string can be translated into a
	390	* given charset without any missing characters.
	391	*/
	392	int cvt_ok(int charset, const wchar_t *s)
	393	{
	394	char buf[256];
	395	charset_state state = CHARSET_INIT_STATE;
	396	int err, len = ustrlen(s);
	397
	398	err = 0;
	399	while (len > 0) {
	400	(void)charset_from_unicode(&s, &len, buf, lenof(buf),
	401	charset, &state, &err);
	402	if (err)
	403	return FALSE;
	404	}
	405	return TRUE;
	406	}