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ustring.c
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ustring.c
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/*
* 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 = snewn(1+ustrlen(s), wchar_t);
ustrcpy(r, s);
} else {
r = snew(wchar_t);
*r = 0;
}
return r;
}
static char *ustrtoa_internal(wchar_t const *s, char *outbuf, int size,
int charset, bool careful) {
int len, ret;
bool 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 = false;
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, bool careful)
{
char *outbuf;
int outpos, outlen, len, ret;
bool err;
charset_state state = CHARSET_INIT_STATE;
if (!s) {
return dupstr("");
}
len = ustrlen(s);
outlen = len + 10;
outbuf = snewn(outlen, char);
outpos = 0;
outbuf[outpos] = '\0';
while (len > 0) {
err = false;
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 = sresize(outbuf, outlen, char);
}
outpos += ret;
outbuf[outpos] = '\0';
}
/*
* Clean up
*/
outlen = outpos + 32;
outbuf = sresize(outbuf, outlen, char);
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 = sresize(buf, len, wchar_t);
ustrfroma(s, buf, len, charset);
len = (3 * len) / 2 + 1; /* this guarantees a strict increase */
} while (ustrlen(buf) >= len-1);
buf = sresize(buf, ustrlen(buf)+1, wchar_t);
return buf;
}
char *utoa_locale_dup(wchar_t const *s)
{
/*
* This variant uses the C library locale.
*/
char *ret;
int len, outlen;
size_t siz;
len = ustrlen(s);
outlen = 1 + MB_CUR_MAX * len;
ret = snewn(outlen+1, char);
siz = wcstombs(ret, s, outlen);
if (siz) {
assert(siz <= (size_t)(outlen));
ret[siz] = '\0';
ret = sresize(ret, siz+1, char);
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, outlen;
size_t siz;
len = strlen(s);
outlen = 1 + 2*len;
ret = snewn(outlen+1, wchar_t); /* be conservative */
siz = mbstowcs(ret, s, outlen);
if (siz) {
assert(siz <= (size_t)(outlen));
ret[siz] = L'\0';
ret = sresize(ret, siz+1, wchar_t);
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;
}
wchar_t *ustrncpy(wchar_t *dest, wchar_t const *source, int n) {
wchar_t *ret = dest;
do {
*dest++ = *source;
if (*source) source++;
} while (n-- > 0);
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
}
bool 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 const *lhs, wchar_t const *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;
}
int ustrnicmp(wchar_t const *lhs, wchar_t const *rhs, int maxlen) {
wchar_t lc = 0, rc = 0;
while (maxlen-- > 0 &&
(lc = utolower(*lhs)) == (rc = utolower(*rhs)) && lc && rc)
lhs++, rhs++;
if (lc < rc)
return -1;
else if (lc > rc)
return 1;
else
return 0;
}
wchar_t *ustrlow(wchar_t *s) {
wchar_t *p = s;
while (*p) {
*p = utolower(*p);
p++;
}
return s;
}
int utoi(wchar_t const *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 * sign;
}
double utof(wchar_t const *s)
{
char *cs = utoa_dup(s, CS_ASCII);
double ret = atof(cs);
sfree(cs);
return ret;
}
bool utob(wchar_t const *s) {
if (!ustricmp(s, L"yes") || !ustricmp(s, L"y") ||
!ustricmp(s, L"true") || !ustricmp(s, L"t"))
return true;
return false;
}
bool uisdigit(wchar_t c) {
return c >= L'0' && c <= L'9';
}
#define USTRFTIME_DELTA 128
static void ustrftime_internal(rdstring *rs, char formatchr,
const struct tm *timespec)
{
/*
* 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?
*/
#ifdef HAS_WCSFTIME
wchar_t *buf = NULL;
wchar_t fmt[4];
int size, ret;
fmt[0] = L' ';
fmt[1] = L'%';
/* Format chars are all ASCII, so conversion to Unicode is no problem */
fmt[2] = formatchr;
fmt[3] = L'\0';
size = 0;
do {
size += USTRFTIME_DELTA;
buf = sresize(buf, size, wchar_t);
ret = (int) wcsftime(buf, size, fmt, timespec);
} while (ret == 0);
rdadds(rs, buf+1);
sfree(buf);
#else
char *buf = NULL;
wchar_t *cvtbuf;
char fmt[4];
int size, ret;
fmt[0] = ' ';
fmt[1] = '%';
fmt[2] = formatchr;
fmt[3] = '\0';
size = 0;
do {
size += USTRFTIME_DELTA;
buf = sresize(buf, size, char);
ret = (int) strftime(buf, size, fmt, timespec);
} while (ret == 0);
cvtbuf = ufroma_locale_dup(buf+1);
rdadds(rs, cvtbuf);
sfree(cvtbuf);
sfree(buf);
#endif
}
wchar_t *ustrftime(const wchar_t *wfmt, const struct tm *timespec)
{
rdstring rs = { 0, 0, NULL };
if (!wfmt)
wfmt = L"%c";
while (*wfmt) {
if (wfmt[0] == L'%' && wfmt[1] == L'%') {
rdadd(&rs, L'%');
wfmt += 2;
} else if (wfmt[0] == L'%' && wfmt[1]) {
ustrftime_internal(&rs, wfmt[1], timespec);
wfmt += 2;
} else {
rdadd(&rs, wfmt[0]);
wfmt++;
}
}
return rdtrim(&rs);
}
/*
* Determine whether a Unicode string can be translated into a
* given charset without any missing characters.
*/
bool cvt_ok(int charset, const wchar_t *s)
{
char buf[256];
charset_state state = CHARSET_INIT_STATE;
bool err;
int len = ustrlen(s);
err = false;
while (len > 0) {
(void)charset_from_unicode(&s, &len, buf, lenof(buf),
charset, &state, &err);
if (err)
return false;
}
return true;
}
/*
* Wrapper around charset_from_localenc which accepts the charset
* name as a wide string (since that happens to be more useful).
* Also throws a Halibut error and falls back to CS_ASCII if the
* charset is unrecognised, meaning the rest of the program can
* rely on always getting a valid charset id back from this
* function.
*/
int charset_from_ustr(filepos *fpos, const wchar_t *name, errorstate *es)
{
char *csname;
int charset;
csname = utoa_dup(name, CS_ASCII);
charset = charset_from_localenc(csname);
if (charset == CS_NONE) {
charset = CS_ASCII;
err_charset(es, fpos, name);
}
sfree(csname);
return charset;
}