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#include "fmt.h"
#include "textcode.h"
#include "str.h"
#include "haveinline.h"
unsigned long fmt_cescape(char* dest,const char* src,unsigned long len) {
register const unsigned char* s=(const unsigned char*) src;
unsigned long written=0,i;
char c;
for (i=0; i<len; ++i) {
switch (s[i]) {
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[written]='\\';
dest[written+1]=c;
}
written+=2;
break;
default:
if (s[i]<' ') {
if (dest) {
dest[written]='\\';
dest[written+1]='x';
dest[written+2]=fmt_tohex(s[i]>>4);
dest[written+3]=fmt_tohex(s[i]&0xf);
}
written+=4;
} else {
if (dest) dest[written]=s[i];
++written;
}
break;
}
}
return written;
}
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