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/*************************************************************************
* Copyright (c) 2011 AT&T Intellectual Property
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/legal/epl-v10.html
*
* Contributors: Details at https://graphviz.org
*************************************************************************/
/*
* Glenn Fowler
* AT&T Research
*
* return string with expanded escape chars
*/
#include <ast/ast.h>
#include <stdbool.h>
#include <stdlib.h>
#include <string.h>
#include <util/agxbuf.h>
#include <util/gv_ctype.h>
/// quote string as with qb...qe
char *fmtquote(const char *as, const char *qb, const char *qe) {
const size_t n = strlen(as);
const unsigned char *s = (const unsigned char *) as;
const unsigned char *e = s + n;
bool escaped = false;
bool spaced = false;
bool shell = false;
agxbuf b = {0};
if (qb) {
if (qb[0] == '$' && qb[1] == '\'' && qb[2] == 0)
shell = true;
agxbput(&b, qb);
}
char last = '\0';
#define PUT(ch) \
do { \
last = (ch); \
agxbputc(&b, (ch)); \
} while (0)
while (s < e) {
int c = *s++;
if (gv_iscntrl(c) || !gv_isprint(c) || c == '\\') {
escaped = true;
PUT('\\');
switch (c) {
case CC_bel:
c = 'a';
break;
case '\b':
c = 'b';
break;
case '\f':
c = 'f';
break;
case '\n':
c = 'n';
break;
case '\r':
c = 'r';
break;
case '\t':
c = 't';
break;
case CC_vt:
c = 'v';
break;
case CC_esc:
c = 'E';
break;
case '\\':
break;
default:
PUT((char)('0' + ((c >> 6) & 07)));
PUT((char)('0' + ((c >> 3) & 07)));
c = '0' + (c & 07);
break;
}
} else if (qe && strchr(qe, c)) {
escaped = true;
PUT('\\');
} else if (!spaced &&
!escaped &&
(gv_isspace(c) ||
(shell &&
(strchr("\";~&|()<>[]*?", c) ||
(c == '#' && (last == '\0' || gv_isspace(last))
)
)
)
)
)
spaced = true;
PUT((char)c);
}
#undef PUT
if (qb) {
if (!escaped) {
const size_t move_by = (size_t)(shell + !spaced);
if (move_by > 0) {
char *content = agxbdisown(&b);
agxbput(&b, content + move_by);
free(content);
}
}
if (qe && (escaped || spaced))
agxbput(&b, qe);
}
return agxbdisown(&b);
}
/*
* escape the usual suspects and quote chars in qs
*/
char *fmtesq(const char *as, const char *qs)
{
return fmtquote(as, NULL, qs);
}
/*
* escape the usual suspects
*/
char *fmtesc(const char *as)
{
return fmtquote(as, NULL, NULL);
}
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