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#ifndef UTIL_LINUX_CAREFULPUTC_H
#define UTIL_LINUX_CAREFULPUTC_H
/*
* A putc() for use in write and wall (that sometimes are sgid tty).
* It avoids control characters in our locale, and also ASCII control
* characters. Note that the locale of the recipient is unknown.
*/
#include <stdio.h>
#include <string.h>
#include <ctype.h>
static inline int fputc_careful(int c, FILE *fp, const char fail)
{
int ret;
if (isprint(c) || c == '\a' || c == '\t' || c == '\r' || c == '\n')
ret = putc(c, fp);
else if (!isascii(c))
ret = fprintf(fp, "\\%3o", (unsigned char)c);
else {
ret = putc(fail, fp);
if (ret != EOF)
ret = putc(c ^ 0x40, fp);
}
return (ret < 0) ? EOF : 0;
}
/*
* Requirements enumerated via testing (V8, Firefox, IE11):
*
* var charsToEscape = [];
* for (var i = 0; i < 65535; i += 1) {
* try {
* JSON.parse('{"sample": "' + String.fromCodePoint(i) + '"}');
* } catch (e) {
* charsToEscape.push(i);
* }
* }
*/
static inline void fputs_quoted_case_json(const char *data, FILE *out, int dir)
{
const char *p;
fputc('"', out);
for (p = data; p && *p; p++) {
const unsigned char c = (unsigned char) *p;
/* From http://www.json.org
*
* The double-quote and backslashes would break out a string or
* init an escape sequence if not escaped.
*
* Note that single-quotes and forward slashes, while they're
* in the JSON spec, don't break double-quoted strings.
*/
if (c == '"' || c == '\\') {
fputc('\\', out);
fputc(c, out);
continue;
}
/* All non-control characters OK; do the case swap as required. */
if (c >= 0x20) {
fputc(dir == 1 ? toupper(c) :
dir == -1 ? tolower(c) : *p, out);
continue;
}
/* In addition, all chars under ' ' break Node's/V8/Chrome's, and
* Firefox's JSON.parse function
*/
switch (c) {
/* Handle short-hand cases to reduce output size. C
* has most of the same stuff here, so if there's an
* "Escape for C" function somewhere in the STL, we
* should probably be using it.
*/
case '\b':
fputs("\\b", out);
break;
case '\t':
fputs("\\t", out);
break;
case '\n':
fputs("\\n", out);
break;
case '\f':
fputs("\\f", out);
break;
case '\r':
fputs("\\r", out);
break;
default:
/* Other assorted control characters */
fprintf(out, "\\u00%02x", c);
break;
}
}
fputc('"', out);
}
static inline void fputs_quoted_case(const char *data, FILE *out, int dir)
{
const char *p;
fputc('"', out);
for (p = data; p && *p; p++) {
if ((unsigned char) *p == 0x22 || /* " */
(unsigned char) *p == 0x5c || /* \ */
(unsigned char) *p == 0x60 || /* ` */
(unsigned char) *p == 0x24 || /* $ */
!isprint((unsigned char) *p) ||
iscntrl((unsigned char) *p)) {
fprintf(out, "\\x%02x", (unsigned char) *p);
} else
fputc(dir == 1 ? toupper(*p) :
dir == -1 ? tolower(*p) :
*p, out);
}
fputc('"', out);
}
#define fputs_quoted(_d, _o) fputs_quoted_case(_d, _o, 0)
#define fputs_quoted_upper(_d, _o) fputs_quoted_case(_d, _o, 1)
#define fputs_quoted_lower(_d, _o) fputs_quoted_case(_d, _o, -1)
#define fputs_quoted_json(_d, _o) fputs_quoted_case_json(_d, _o, 0)
#define fputs_quoted_json_upper(_d, _o) fputs_quoted_case_json(_d, _o, 1)
#define fputs_quoted_json_lower(_d, _o) fputs_quoted_case_json(_d, _o, -1)
static inline void fputs_nonblank(const char *data, FILE *out)
{
const char *p;
for (p = data; p && *p; p++) {
if (isblank((unsigned char) *p) ||
(unsigned char) *p == 0x5c || /* \ */
!isprint((unsigned char) *p) ||
iscntrl((unsigned char) *p)) {
fprintf(out, "\\x%02x", (unsigned char) *p);
} else
fputc(*p, out);
}
}
#endif /* _CAREFULPUTC_H */
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