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