#include "switch_utf8.h"

Include dependency graph for switch_utf8.c:

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

◆ hex_digit()

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'));
 }

◆ octal_digit()

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');
 }

◆ switch_u8_charnum()

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;
 }

◆ switch_u8_dec()

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));
 }

◆ switch_u8_escape()

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;
 }

◆ switch_u8_escape_wchar()

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);
 }

◆ switch_u8_get_char()

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;
 }

◆ switch_u8_inc()

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));
 }

◆ switch_u8_is_locale_utf8()

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;
 }

◆ switch_u8_memchr()

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;
 }

◆ switch_u8_nextchar()

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;
 }

◆ switch_u8_offset()

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;
 }

◆ switch_u8_read_escape_sequence()

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;
 }

◆ switch_u8_seqlen()

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;
 }

◆ switch_u8_strchr()

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;
 }

◆ switch_u8_strlen()

int switch_u8_strlen ( char * s )

Definition at line 220 of file switch_utf8.c.

References count, and switch_u8_nextchar().

 {
         int count = 0;
         int i = 0;
 
         while (switch_u8_nextchar(s, &i) != 0)
                 count++;
 
         return count;
 }

◆ switch_u8_toucs()

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;
 }

◆ switch_u8_toutf8()

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;
 }

◆ switch_u8_unescape()

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;
 }

◆ switch_u8_wc_toutf8()

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

◆ offsetsFromUTF8

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().

◆ trailingBytesForUTF8

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().

Functions

Variables

Function Documentation

◆ hex_digit()

◆ octal_digit()

◆ switch_u8_charnum()

◆ switch_u8_dec()

◆ switch_u8_escape()

◆ switch_u8_escape_wchar()

◆ switch_u8_get_char()

◆ switch_u8_inc()

◆ switch_u8_is_locale_utf8()

◆ switch_u8_memchr()

◆ switch_u8_nextchar()

◆ switch_u8_offset()

◆ switch_u8_read_escape_sequence()

◆ switch_u8_seqlen()

◆ switch_u8_strchr()

◆ switch_u8_strlen()

◆ switch_u8_toucs()

◆ switch_u8_toutf8()

◆ switch_u8_unescape()

◆ switch_u8_wc_toutf8()

Variable Documentation

◆ offsetsFromUTF8

◆ trailingBytesForUTF8