#include "config.h"
#if defined(LIBC_SCCS) && !defined(lint)
__RCSID("$NetBSD: vis.c,v 1.41 2009/11/23 10:08:47 plunky Exp $");
#endif
#include <sys/types.h>
#include <assert.h>
#include <vis.h>
#include <stdlib.h>
#ifdef __weak_alias
__weak_alias(strsvis,_strsvis)
__weak_alias(strsvisx,_strsvisx)
__weak_alias(strvis,_strvis)
__weak_alias(strvisx,_strvisx)
__weak_alias(svis,_svis)
__weak_alias(vis,_vis)
#endif
#if !HAVE_VIS || !HAVE_SVIS
#include <ctype.h>
#include <limits.h>
#include <stdio.h>
#include <string.h>
static char *do_svis(char *, int, int, int, const char *);
#undef BELL
#define BELL '\a'
#define isoctal(c) (((u_char)(c)) >= '0' && ((u_char)(c)) <= '7')
#define iswhite(c) (c == ' ' || c == '\t' || c == '\n')
#define issafe(c) (c == '\b' || c == BELL || c == '\r')
#define xtoa(c) "0123456789abcdef"[c]
#define XTOA(c) "0123456789ABCDEF"[c]
#define MAXEXTRAS 5
#define MAKEEXTRALIST(flag, extra, orig_str) \
do { \
const char *orig = orig_str; \
const char *o = orig; \
char *e; \
while (*o++) \
continue; \
extra = malloc((size_t)((o - orig) + MAXEXTRAS)); \
if (!extra) break; \
for (o = orig, e = extra; (*e++ = *o++) != '\0';) \
continue; \
e--; \
if (flag & VIS_SP) *e++ = ' '; \
if (flag & VIS_TAB) *e++ = '\t'; \
if (flag & VIS_NL) *e++ = '\n'; \
if ((flag & VIS_NOSLASH) == 0) *e++ = '\\'; \
*e = '\0'; \
} while (0)
static char *
do_hvis(char *dst, int c, int flag, int nextc, const char *extra)
{
if ((isascii(c) && isalnum(c))
|| c == '$' || c == '-' || c == '_' || c == '.' || c == '+'
|| c == '!' || c == '*' || c == '\'' || c == '(' || c == ')'
|| c == ',') {
dst = do_svis(dst, c, flag, nextc, extra);
} else {
*dst++ = '%';
*dst++ = xtoa(((unsigned int)c >> 4) & 0xf);
*dst++ = xtoa((unsigned int)c & 0xf);
}
return dst;
}
static char *
do_mvis(char *dst, int c, int flag, int nextc, const char *extra)
{
if ((c != '\n') &&
((isspace(c) && (nextc == '\r' || nextc == '\n')) ||
(!isspace(c) && (c < 33 || (c > 60 && c < 62) || c > 126)) ||
strchr("#$@[\\]^`{|}~", c) != NULL)) {
*dst++ = '=';
*dst++ = XTOA(((unsigned int)c >> 4) & 0xf);
*dst++ = XTOA((unsigned int)c & 0xf);
} else {
dst = do_svis(dst, c, flag, nextc, extra);
}
return dst;
}
static char *
do_svis(char *dst, int c, int flag, int nextc, const char *extra)
{
int isextra;
isextra = strchr(extra, c) != NULL;
if (!isextra && isascii(c) && (isgraph(c) || iswhite(c) ||
((flag & VIS_SAFE) && issafe(c)))) {
*dst++ = c;
return dst;
}
if (flag & VIS_CSTYLE) {
switch (c) {
case '\n':
*dst++ = '\\'; *dst++ = 'n';
return dst;
case '\r':
*dst++ = '\\'; *dst++ = 'r';
return dst;
case '\b':
*dst++ = '\\'; *dst++ = 'b';
return dst;
case BELL:
*dst++ = '\\'; *dst++ = 'a';
return dst;
case '\v':
*dst++ = '\\'; *dst++ = 'v';
return dst;
case '\t':
*dst++ = '\\'; *dst++ = 't';
return dst;
case '\f':
*dst++ = '\\'; *dst++ = 'f';
return dst;
case ' ':
*dst++ = '\\'; *dst++ = 's';
return dst;
case '\0':
*dst++ = '\\'; *dst++ = '0';
if (isoctal(nextc)) {
*dst++ = '0';
*dst++ = '0';
}
return dst;
default:
if (isgraph(c)) {
*dst++ = '\\'; *dst++ = c;
return dst;
}
}
}
if (isextra || ((c & 0177) == ' ') || (flag & VIS_OCTAL)) {
*dst++ = '\\';
*dst++ = (u_char)(((u_int32_t)(u_char)c >> 6) & 03) + '0';
*dst++ = (u_char)(((u_int32_t)(u_char)c >> 3) & 07) + '0';
*dst++ = (c & 07) + '0';
} else {
if ((flag & VIS_NOSLASH) == 0) *dst++ = '\\';
if (c & 0200) {
c &= 0177; *dst++ = 'M';
}
if (iscntrl(c)) {
*dst++ = '^';
if (c == 0177)
*dst++ = '?';
else
*dst++ = c + '@';
} else {
*dst++ = '-'; *dst++ = c;
}
}
return dst;
}
typedef char *(*visfun_t)(char *, int, int, int, const char *);
static visfun_t
getvisfun(int flag)
{
if (flag & VIS_HTTPSTYLE)
return do_hvis;
if (flag & VIS_MIMESTYLE)
return do_mvis;
return do_svis;
}
char *
svis(char *dst, int c, int flag, int nextc, const char *extra)
{
char *nextra = NULL;
visfun_t f;
_DIAGASSERT(dst != NULL);
_DIAGASSERT(extra != NULL);
MAKEEXTRALIST(flag, nextra, extra);
if (!nextra) {
*dst = '\0';
return dst;
}
f = getvisfun(flag);
dst = (*f)(dst, c, flag, nextc, nextra);
free(nextra);
*dst = '\0';
return dst;
}
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;
visfun_t f;
_DIAGASSERT(dst != NULL);
_DIAGASSERT(src != NULL);
_DIAGASSERT(extra != NULL);
MAKEEXTRALIST(flag, nextra, extra);
if (!nextra) {
*dst = '\0';
return 0;
}
f = getvisfun(flag);
for (start = dst; (c = *src++) != '\0'; )
dst = (*f)(dst, c, flag, *src, nextra);
free(nextra);
*dst = '\0';
return (int)(dst - start);
}
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;
visfun_t f;
_DIAGASSERT(dst != NULL);
_DIAGASSERT(src != NULL);
_DIAGASSERT(extra != NULL);
MAKEEXTRALIST(flag, nextra, extra);
if (! nextra) {
*dst = '\0';
return 0;
}
f = getvisfun(flag);
for (start = dst; len > 0; len--) {
c = *src++;
dst = (*f)(dst, c, flag, len > 1 ? *src : '\0', nextra);
}
free(nextra);
*dst = '\0';
return (int)(dst - start);
}
#endif
#if !HAVE_VIS
char *
vis(char *dst, int c, int flag, int nextc)
{
char *extra = NULL;
unsigned char uc = (unsigned char)c;
visfun_t f;
_DIAGASSERT(dst != NULL);
MAKEEXTRALIST(flag, extra, "");
if (! extra) {
*dst = '\0';
return dst;
}
f = getvisfun(flag);
dst = (*f)(dst, uc, flag, nextc, extra);
free(extra);
*dst = '\0';
return dst;
}
int
strvis(char *dst, const char *src, int flag)
{
char *extra = NULL;
int rv;
MAKEEXTRALIST(flag, extra, "");
if (!extra) {
*dst = '\0';
return 0;
}
rv = strsvis(dst, src, flag, extra);
free(extra);
return rv;
}
int
strvisx(char *dst, const char *src, size_t len, int flag)
{
char *extra = NULL;
int rv;
MAKEEXTRALIST(flag, extra, "");
if (!extra) {
*dst = '\0';
return 0;
}
rv = strsvisx(dst, src, len, flag, extra);
free(extra);
return rv;
}
#endif