switch_utf8.c File Reference

#include "switch_utf8.h"

Include dependency graph for switch_utf8.c:

Go to the source code of this file.

Functions
int	switch_u8_seqlen (char *s)
int	switch_u8_toucs (uint32_t *dest, int sz, char *src, int srcsz)
int	switch_u8_toutf8 (char *dest, int sz, uint32_t *src, int srcsz)
int	switch_u8_wc_toutf8 (char *dest, uint32_t ch)
int	switch_u8_offset (char *str, int charnum)
int	switch_u8_charnum (char *s, int offset)
int	switch_u8_strlen (char *s)
uint32_t	switch_u8_nextchar (char *s, int *i)
void	switch_u8_inc (char *s, int *i)
void	switch_u8_dec (char *s, int *i)
int	octal_digit (char c)
int	hex_digit (char c)
int	switch_u8_read_escape_sequence (char *str, uint32_t *dest)
int	switch_u8_unescape (char *buf, int sz, char *src)
int	switch_u8_escape_wchar (char *buf, int sz, uint32_t ch)
int	switch_u8_escape (char *buf, int sz, char *src, int escape_quotes)
char *	switch_u8_strchr (char *s, uint32_t ch, int *charn)
char *	switch_u8_memchr (char *s, uint32_t ch, size_t sz, int *charn)
int	switch_u8_is_locale_utf8 (char *locale)
uint32_t	switch_u8_get_char (char *s, int *i)

Variables
static const uint32_t	offsetsFromUTF8 [6]
static const char	trailingBytesForUTF8 [256]

Function Documentation

int hex_digit

(

char

c

)

Definition at line 264 of file switch_utf8.c.

Referenced by switch_u8_read_escape_sequence().

{
        return ((c >= '0' && c <= '9') ||
                        (c >= 'A' && c <= 'F') ||
                        (c >= 'a' && c <= 'f'));
}

int octal_digit

(

char

c

)

Definition at line 259 of file switch_utf8.c.

Referenced by switch_u8_read_escape_sequence().

{
        return (c >= '0' && c <= '7');
}

int switch_u8_charnum	(	char *	s,
		int	offset
	)

Definition at line 207 of file switch_utf8.c.

References isutf.

{
        int charnum = 0, offs=0;

        while (offs < offset && s[offs]) {
                (void)(isutf(s[++offs]) || isutf(s[++offs]) ||
                                isutf(s[++offs]) || ++offs);
                charnum++;
        }
        return charnum;
}

void switch_u8_dec	(	char *	s,
		int *	i
	)

Definition at line 253 of file switch_utf8.c.

References isutf.

{
        (void)(isutf(s[--(*i)]) || isutf(s[--(*i)]) ||
                        isutf(s[--(*i)]) || --(*i));
}

int switch_u8_escape	(	char *	buf,
		int	sz,
		char *	src,
		int	escape_quotes
	)

Definition at line 385 of file switch_utf8.c.

References switch_u8_escape_wchar(), and switch_u8_nextchar().

{
        int c=0, i=0, amt;

        while (src[i] && c < sz) {
                if (escape_quotes && src[i] == '"') {
                        amt = snprintf(buf, sz - c, "\\\"");
                        i++;
                }
                else {
                        amt = switch_u8_escape_wchar(buf, sz - c, switch_u8_nextchar(src, &i));
                }
                c += amt;
                buf += amt;
        }
        if (c < sz)
                *buf = '\0';
        return c;
}

int switch_u8_escape_wchar	(	char *	buf,
		int	sz,
		uint32_t	ch
	)

Definition at line 357 of file switch_utf8.c.

Referenced by switch_u8_escape().

{
        if (ch == L'\n')
                return snprintf(buf, sz, "\\n");
        else if (ch == L'\t')
                return snprintf(buf, sz, "\\t");
        else if (ch == L'\r')
                return snprintf(buf, sz, "\\r");
        else if (ch == L'\b')
                return snprintf(buf, sz, "\\b");
        else if (ch == L'\f')
                return snprintf(buf, sz, "\\f");
        else if (ch == L'\v')
                return snprintf(buf, sz, "\\v");
        else if (ch == L'\a')
                return snprintf(buf, sz, "\\a");
        else if (ch == L'\\')
                return snprintf(buf, sz, "\\\\");
        else if (ch < 32 || ch == 0x7f)
                return snprintf(buf, sz, "\\x%hhX", (unsigned char)ch);
        else if (ch > 0xFFFF)
                return snprintf(buf, sz, "\\U%.8X", (uint32_t)ch);
        else if (ch >= 0x80 && ch <= 0xFFFF)
                return snprintf(buf, sz, "\\u%.4hX", (unsigned short)ch);

        return snprintf(buf, sz, "%c", (char)ch);
}

uint32_t switch_u8_get_char	(	char *	s,
		int *	i
	)

Definition at line 469 of file switch_utf8.c.

References isutf, and offsetsFromUTF8.

Referenced by switch_img_txt_handle_render().

{
        uint32_t ch = 0;
        int sz = 0;

        do {
                ch <<= 6;
                ch += (unsigned char)s[(*i)++];
                sz++;
        } while (s[*i] && !isutf(s[*i]));

        ch -= offsetsFromUTF8[sz-1];

        return ch;
}

void switch_u8_inc	(	char *	s,
		int *	i
	)

Definition at line 247 of file switch_utf8.c.

References isutf.

{
        (void)(isutf(s[++(*i)]) || isutf(s[++(*i)]) ||
                        isutf(s[++(*i)]) || ++(*i));
}

int switch_u8_is_locale_utf8

(

char *

locale

)

Definition at line 447 of file switch_utf8.c.

{
        /* this code based on libutf8 */
        const char* cp = locale;

        for (; *cp != '\0' && *cp != '@' && *cp != '+' && *cp != ','; cp++) {
                if (*cp == '.') {
                        const char* encoding = ++cp;
                        for (; *cp != '\0' && *cp != '@' && *cp != '+' && *cp != ','; cp++)
                                ;
                        if ((cp-encoding == 5 && !strncmp(encoding, "UTF-8", 5))
                                        || (cp-encoding == 4 && !strncmp(encoding, "utf8", 4)))
                                return 1; /* it's UTF-8 */
                        break;
                }
        }
        return 0;
}

char* switch_u8_memchr	(	char *	s,
		uint32_t	ch,
		size_t	sz,
		int *	charn
	)

Definition at line 422 of file switch_utf8.c.

References isutf, and offsetsFromUTF8.

{
        int i = 0, lasti=0;
        uint32_t c;
        int csz;

        *charn = 0;
        while (i < sz) {
                c = csz = 0;
                do {
                        c <<= 6;
                        c += (unsigned char)s[i++];
                        csz++;
                } while (i < sz && !isutf(s[i]));
                c -= offsetsFromUTF8[csz-1];

                if (c == ch) {
                        return &s[lasti];
                }
                lasti = i;
                (*charn)++;
        }
        return NULL;
}

uint32_t switch_u8_nextchar	(	char *	s,
		int *	i
	)

Definition at line 232 of file switch_utf8.c.

References isutf, and offsetsFromUTF8.

Referenced by switch_u8_escape(), switch_u8_strchr(), and switch_u8_strlen().

{
        uint32_t ch = 0;
        int sz = 0;

        do {
                ch <<= 6;
                ch += (unsigned char)s[(*i)++];
                sz++;
        } while (s[*i] && !isutf(s[*i]));
        ch -= offsetsFromUTF8[sz-1];

        return ch;
}

int switch_u8_offset	(	char *	str,
		int	charnum
	)

Definition at line 194 of file switch_utf8.c.

References isutf.

{
        int offs=0;

        while (charnum > 0 && str[offs]) {
                (void)(isutf(str[++offs]) || isutf(str[++offs]) ||
                                isutf(str[++offs]) || ++offs);
                charnum--;
        }
        return offs;
}

int switch_u8_read_escape_sequence	(	char *	str,
		uint32_t *	dest
	)

Definition at line 273 of file switch_utf8.c.

References hex_digit(), and octal_digit().

Referenced by switch_u8_unescape().

{
        uint32_t ch;
        char digs[9]="\0\0\0\0\0\0\0\0";
        int dno=0, i=1;

        ch = (uint32_t)str[0];    /* take literal character */
        if (str[0] == 'n')
                ch = L'\n';
        else if (str[0] == 't')
                ch = L'\t';
        else if (str[0] == 'r')
                ch = L'\r';
        else if (str[0] == 'b')
                ch = L'\b';
        else if (str[0] == 'f')
                ch = L'\f';
        else if (str[0] == 'v')
                ch = L'\v';
        else if (str[0] == 'a')
                ch = L'\a';
        else if (octal_digit(str[0])) {
                i = 0;
                do {
                        digs[dno++] = str[i++];
                } while (octal_digit(str[i]) && dno < 3);
                ch = strtol(digs, NULL, 8);
        }
        else if (str[0] == 'x') {
                while (hex_digit(str[i]) && dno < 2) {
                        digs[dno++] = str[i++];
                }
                if (dno > 0)
                        ch = strtol(digs, NULL, 16);
        }
        else if (str[0] == 'u') {
                while (hex_digit(str[i]) && dno < 4) {
                        digs[dno++] = str[i++];
                }
                if (dno > 0)
                        ch = strtol(digs, NULL, 16);
        }
        else if (str[0] == 'U') {
                while (hex_digit(str[i]) && dno < 8) {
                        digs[dno++] = str[i++];
                }
                if (dno > 0)
                        ch = strtol(digs, NULL, 16);
        }
        *dest = ch;

        return i;
}

int switch_u8_seqlen

(

char *

s

)

Definition at line 65 of file switch_utf8.c.

References trailingBytesForUTF8.

{
        return trailingBytesForUTF8[(unsigned int)(unsigned char)s[0]] + 1;
}

char* switch_u8_strchr	(	char *	s,
		uint32_t	ch,
		int *	charn
	)

Definition at line 405 of file switch_utf8.c.

References switch_u8_nextchar().

{
        int i = 0, lasti=0;
        uint32_t c;

        *charn = 0;
        while (s[i]) {
                c = switch_u8_nextchar(s, &i);
                if (c == ch) {
                        return &s[lasti];
                }
                lasti = i;
                (*charn)++;
        }
        return NULL;
}

int switch_u8_strlen

(

char *

s

)

Definition at line 220 of file switch_utf8.c.

References switch_u8_nextchar().

{
        int count = 0;
        int i = 0;

        while (switch_u8_nextchar(s, &i) != 0)
                count++;

        return count;
}

int switch_u8_toucs	(	uint32_t *	dest,
		int	sz,
		char *	src,
		int	srcsz
	)

Definition at line 80 of file switch_utf8.c.

References offsetsFromUTF8, and trailingBytesForUTF8.

{
        uint32_t ch;
        char *src_end = src + srcsz;
        int nb;
        int i=0;

        while (i < sz-1) {
                nb = trailingBytesForUTF8[(unsigned char)*src];
                if (srcsz == -1) {
                        if (*src == 0)
                                goto done_toucs;
                }
                else {
                        if (src + nb >= src_end)
                                goto done_toucs;
                }
                ch = 0;
                switch (nb) {
                        /* these fall through deliberately */
                        case 3: ch += (unsigned char)*src++; ch <<= 6;
                        case 2: ch += (unsigned char)*src++; ch <<= 6;
                        case 1: ch += (unsigned char)*src++; ch <<= 6;
                        case 0: ch += (unsigned char)*src++;
                }
                ch -= offsetsFromUTF8[nb];
                dest[i++] = ch;
        }
done_toucs:
        dest[i] = 0;
        return i;
}

int switch_u8_toutf8	(	char *	dest,
		int	sz,
		uint32_t *	src,
		int	srcsz
	)

Definition at line 125 of file switch_utf8.c.

{
        uint32_t ch;
        int i = 0;
        char *dest_end = dest + sz;

        while (srcsz<0 ? src[i]!=0 : i < srcsz) {
                ch = src[i];
                if (ch < 0x80) {
                        if (dest >= dest_end)
                                return i;
                        *dest++ = (char)ch;
                }
                else if (ch < 0x800) {
                        if (dest >= dest_end-1)
                                return i;
                        *dest++ = (ch>>6) | 0xC0;
                        *dest++ = (ch & 0x3F) | 0x80;
                }
                else if (ch < 0x10000) {
                        if (dest >= dest_end-2)
                                return i;
                        *dest++ = (ch>>12) | 0xE0;
                        *dest++ = ((ch>>6) & 0x3F) | 0x80;
                        *dest++ = (ch & 0x3F) | 0x80;
                }
                else if (ch < 0x110000) {
                        if (dest >= dest_end-3)
                                return i;
                        *dest++ = (ch>>18) | 0xF0;
                        *dest++ = ((ch>>12) & 0x3F) | 0x80;
                        *dest++ = ((ch>>6) & 0x3F) | 0x80;
                        *dest++ = (ch & 0x3F) | 0x80;
                }
                i++;
        }
        if (dest < dest_end)
                *dest = '\0';
        return i;
}

int switch_u8_unescape	(	char *	buf,
		int	sz,
		char *	src
	)

Definition at line 330 of file switch_utf8.c.

References switch_u8_read_escape_sequence(), and switch_u8_wc_toutf8().

{
        int c=0, amt;
        uint32_t ch;
        char temp[4];

        while (*src && c < sz) {
                if (*src == '\\') {
                        src++;
                        amt = switch_u8_read_escape_sequence(src, &ch);
                }
                else {
                        ch = (uint32_t)*src;
                        amt = 1;
                }
                src += amt;
                amt = switch_u8_wc_toutf8(temp, ch);
                if (amt > sz-c)
                        break;
                memcpy(&buf[c], temp, amt);
                c += amt;
        }
        if (c < sz)
                buf[c] = '\0';
        return c;
}

int switch_u8_wc_toutf8	(	char *	dest,
		uint32_t	ch
	)

Definition at line 166 of file switch_utf8.c.

Referenced by switch_u8_unescape().

{
        if (ch < 0x80) {
                dest[0] = (char)ch;
                return 1;
        }
        if (ch < 0x800) {
                dest[0] = (ch>>6) | 0xC0;
                dest[1] = (ch & 0x3F) | 0x80;
                return 2;
        }
        if (ch < 0x10000) {
                dest[0] = (ch>>12) | 0xE0;
                dest[1] = ((ch>>6) & 0x3F) | 0x80;
                dest[2] = (ch & 0x3F) | 0x80;
                return 3;
        }
        if (ch < 0x110000) {
                dest[0] = (ch>>18) | 0xF0;
                dest[1] = ((ch>>12) & 0x3F) | 0x80;
                dest[2] = ((ch>>6) & 0x3F) | 0x80;
                dest[3] = (ch & 0x3F) | 0x80;
                return 4;
        }
        return 0;
}

Variable Documentation

const uint32_t offsetsFromUTF8[6]

static

Initial value:

= {
    0x00000000UL, 0x00003080UL, 0x000E2080UL,
    0x03C82080UL, 0xFA082080UL, 0x82082080UL
}

Definition at line 48 of file switch_utf8.c.

Referenced by switch_u8_get_char(), switch_u8_memchr(), switch_u8_nextchar(), and switch_u8_toucs().

const char trailingBytesForUTF8[256]

static

Initial value:

= {
    0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
    0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
    0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
    0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
    0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
    0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
    1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
    2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2, 3,3,3,3,3,3,3,3,4,4,4,4,5,5,5,5
}

Definition at line 53 of file switch_utf8.c.

Referenced by switch_u8_seqlen(), and switch_u8_toucs().