69 lines
3.3 KiB
C
69 lines
3.3 KiB
C
|
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
|
||
|
|
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
|
||
|
|
╞══════════════════════════════════════════════════════════════════════════════╡
|
||
|
|
│ Copyright 2020 Justine Alexandra Roberts Tunney │
|
||
|
|
│ │
|
||
|
|
│ This program is free software; you can redistribute it and/or modify │
|
||
|
|
│ it under the terms of the GNU General Public License as published by │
|
||
|
|
│ the Free Software Foundation; version 2 of the License. │
|
||
|
|
│ │
|
||
|
|
│ This program is distributed in the hope that it will be useful, but │
|
||
|
|
│ WITHOUT ANY WARRANTY; without even the implied warranty of │
|
||
|
|
│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
|
||
|
|
│ General Public License for more details. │
|
||
|
|
│ │
|
||
|
|
│ You should have received a copy of the GNU General Public License │
|
||
|
|
│ along with this program; if not, write to the Free Software │
|
||
|
|
│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
|
||
|
|
│ 02110-1301 USA │
|
||
|
|
╚─────────────────────────────────────────────────────────────────────────────*/
|
||
|
|
#include "libc/escape/escape.h"
|
||
|
|
#include "libc/limits.h"
|
||
|
|
#include "libc/sysv/errfuns.h"
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Escapes memory for inclusion in C string literals (or Python, etc.)
|
||
|
|
*
|
||
|
|
* The outer quotation marks are *not* added.
|
||
|
|
*
|
||
|
|
* @param buf is the output area, which can't overlap and, no matter
|
||
|
|
* what, a NUL-terminator will always be placed in the buffer at
|
||
|
|
* an appropriate place, provided buf!=NULL && size!=0
|
||
|
|
* @param size is the byte-length of the output area
|
||
|
|
* @param s is the data, which may have NUL characters
|
||
|
|
* @param l is the byte-length of s or -1 if s is NUL-terminated
|
||
|
|
* @return number of characters written, excluding NUL terminator; or,
|
||
|
|
* if the output buffer wasn't passed, or was too short, then the
|
||
|
|
* number of characters that *would* have been written is returned;
|
||
|
|
* since that's how the snprintf() API works; or -1 on overflow
|
||
|
|
* @see xaescapec() for an easier api
|
||
|
|
*/
|
||
|
|
int escapec(char *buf, unsigned size, const char *s, unsigned l) {
|
||
|
|
if (l >= INT_MAX) return eoverflow();
|
||
|
|
unsigned i, j = 0;
|
||
|
|
for (i = 0; i < l; ++i) {
|
||
|
|
unsigned t = cescapec(s[i]);
|
||
|
|
if (t) {
|
||
|
|
while (t) {
|
||
|
|
if (j < size) {
|
||
|
|
buf[j] = (unsigned char)t;
|
||
|
|
t >>= 8;
|
||
|
|
}
|
||
|
|
j++;
|
||
|
|
}
|
||
|
|
} else {
|
||
|
|
if (l == -1) {
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
if (buf && size) {
|
||
|
|
if (j < size) {
|
||
|
|
buf[j] = '\0';
|
||
|
|
} else {
|
||
|
|
buf[size - 1] = '\0';
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return j;
|
||
|
|
}
|