int
strsvisx(char *dst, const char *csrc, size_t len, int flag, const char *extra)
{
unsigned char c;
char *start;
char *nextra = NULL;
const unsigned char *src = (const unsigned char *)csrc;
MAKEEXTRALIST(flag, nextra, extra);
if (! nextra) {
*dst = '\0'; /* can't create nextra, return "" */
return 0;
}
if (flag & VIS_HTTPSTYLE) {
for (start = dst; len > 0; len--) {
c = *src++;
HVIS(dst, c, flag, len ? *src : '\0', nextra);
}
} else {
for (start = dst; len > 0; len--) {
c = *src++;
SVIS(dst, c, flag, len ? *src : '\0', nextra);
}
}
free(nextra);
*dst = '\0';
return (dst - start);
}
/*
* strsvis, strsvisx - visually encode characters from src into dst
*
* Extra is a pointer to a \0-terminated list of characters to
* be encoded, too. These functions are useful e. g. to
* encode strings in such a way so that they are not interpreted
* by a shell.
*
* Dst must be 4 times the size of src to account for possible
* expansion. The length of dst, not including the trailing NULL,
* is returned.
*
* Strsvisx encodes exactly len bytes from src into dst.
* This is useful for encoding a block of data.
*/
int
strsvis(char *dst, const char *csrc, int flag, const char *extra)
{
int c;
char *start;
char *nextra = NULL;
const unsigned char *src = (const unsigned char *)csrc;
_DIAGASSERT(dst != NULL);
_DIAGASSERT(src != NULL);
_DIAGASSERT(extra != NULL);
MAKEEXTRALIST(flag, nextra, extra);
if (!nextra) {
*dst = '\0'; /* can't create nextra, return "" */
return 0;
}
if (flag & VIS_HTTPSTYLE) {
for (start = dst; (c = *src++) != '\0'; /* empty */)
HVIS(dst, c, flag, *src, nextra);
} else {
for (start = dst; (c = *src++) != '\0'; /* empty */)
SVIS(dst, c, flag, *src, nextra);
}
free(nextra);
*dst = '\0';
return (dst - start);
}
/*
* svis - visually encode characters, also encoding the characters
* pointed to by `extra'
*/
char *
svis(char *dst, int c, int flag, int nextc, const char *extra)
{
char *nextra = NULL;
MAKEEXTRALIST(flag, nextra, extra);
if (!nextra) {
*dst = '\0'; /* can't create nextra, return "" */
return dst;
}
if (flag & VIS_HTTPSTYLE)
HVIS(dst, c, flag, nextc, nextra);
else
SVIS(dst, c, flag, nextc, nextra);
free(nextra);
*dst = '\0';
return dst;
}
/*
* vis - visually encode characters
*/
char *
vis(char *dst, int c, int flag, int nextc)
{
char *extra = NULL;
unsigned char uc = (unsigned char)c;
MAKEEXTRALIST(flag, extra, "");
if (! extra) {
*dst = '\0'; /* can't create extra, return "" */
return dst;
}
if (flag & VIS_HTTPSTYLE)
HVIS(dst, uc, flag, nextc, extra);
else
SVIS(dst, uc, flag, nextc, extra);
free(extra);
*dst = '\0';
return dst;
}
