Mirror of :pserver:cvs@cvs.fefe.de:/cvs libowfat https://www.fefe.de/libowfat/
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#include "fmt.h"
#ifdef UNITTEST
#include "fmt_tohex.c"
#endif
static void fmt_oct3(char* dest,uint8_t w) {
dest[2]=(char)((w&7)+'0'); w>>=3;
dest[1]=(char)((w&7)+'0'); w>>=3;
dest[0]=(char)((w&7)+'0');
}
size_t fmt_escapecharc(char* dest,uint32_t ch) {
char c;
if (ch>0xff) {
if (dest) {
unsigned int i;
dest[0]='\\';
if (ch>0xffff) {
dest[1]='U';
dest[2]=fmt_tohex((ch>>28)&0xf);
dest[3]=fmt_tohex((ch>>24)&0xf);
dest[4]=fmt_tohex((ch>>20)&0xf);
dest[5]=fmt_tohex((ch>>16)&0xf);
i=6;
} else {
dest[1]='u';
i=2;
}
dest[i]=fmt_tohex((ch>>12)&0xf);
dest[i+1]=fmt_tohex((ch>>8)&0xf);
dest[i+2]=fmt_tohex((ch>>4)&0xf);
dest[i+3]=fmt_tohex(ch&0xf);
}
return (ch>0xffff ? 10 : 6);
}
switch (ch) {
case '\a': c='a'; goto doescape;
case '\b': c='b'; goto doescape;
case 0x1b: c='e'; goto doescape;
case '\f': c='f'; goto doescape;
case '\n': c='n'; goto doescape;
case '\r': c='r'; goto doescape;
case '\t': c='t'; goto doescape;
case '\v': c='v'; goto doescape;
case '\\':
c='\\';
doescape:
if (dest) {
dest[0]='\\';
dest[1]=c;
}
return 2;
default:
if (dest) {
dest[0]='\\';
fmt_oct3(dest+1,ch&0xff);
}
return 4;
}
}
#ifdef UNITTEST
#include <assert.h>
#include <string.h>
#include <stdio.h>
int main() {
char buf[100];
assert(fmt_escapecharc(buf,0)==4 && !memcmp(buf,"\\000",4));
assert(fmt_escapecharc(buf,'\a')==2 && !memcmp(buf,"\\a",2));
assert(fmt_escapecharc(buf,'\b')==2 && !memcmp(buf,"\\b",2));
assert(fmt_escapecharc(buf,'\f')==2 && !memcmp(buf,"\\f",2));
assert(fmt_escapecharc(buf,'\n')==2 && !memcmp(buf,"\\n",2));
assert(fmt_escapecharc(buf,'\r')==2 && !memcmp(buf,"\\r",2));
assert(fmt_escapecharc(buf,0x1b)==2 && !memcmp(buf,"\\e",2));
assert(fmt_escapecharc(buf,'\t')==2 && !memcmp(buf,"\\t",2));
assert(fmt_escapecharc(buf,'\v')==2 && !memcmp(buf,"\\v",2));
assert(fmt_escapecharc(buf,'\\')==2 && !memcmp(buf,"\\\\",2));
assert(fmt_escapecharc(buf,'1')==4 && !memcmp(buf,"\\061",4));
assert(fmt_escapecharc(buf,0xfefe)==6 && !memcmp(buf,"\\ufefe",6));
assert(fmt_escapecharc(buf,0xfefec0de)==10 && !memcmp(buf,"\\Ufefec0de",10));
return 0;
}
#endif