File: stringutil.c

package info (click to toggle)
pgq 3.2.6-8
  • links: PTS, VCS
  • area: main
  • in suites: bullseye, buster, sid
  • size: 836 kB
  • sloc: sql: 3,412; ansic: 1,990; python: 302; makefile: 89; sh: 2
file content (202 lines) | stat: -rw-r--r-- 4,807 bytes parent folder | download
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
/*
 * stringutil.c - some tools for string handling
 *
 * Copyright (c) 2007 Marko Kreen, Skype Technologies OÜ
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include <postgres.h>
#include <lib/stringinfo.h>
#include <utils/memutils.h>
#include <utils/builtins.h>
#if PG_VERSION_NUM >= 90200
#include <utils/json.h>
#endif

#include "stringutil.h"

#ifndef SET_VARSIZE
#define SET_VARSIZE(x, len) VARATT_SIZEP(x) = len
#endif

#if PG_VERSION_NUM < 90100
static char *quote_literal_cstr(const char *str)
{
	StringInfoData buf;

	initStringInfo(&buf);

	if (strchr(str, '\\'))
		appendStringInfoCharMacro(&buf, 'E');

	appendStringInfoCharMacro(&buf, '\'');
	for (; *str; str++) {
		if (*str == '\'' || *str == '\\')
			appendStringInfoCharMacro(&buf, *str);
		appendStringInfoCharMacro(&buf, *str);
	}
	appendStringInfoCharMacro(&buf, '\'');
	return buf.data;
}
#endif

StringInfo pgq_init_varbuf(void)
{
	StringInfo buf;
	buf = makeStringInfo();
	appendStringInfoString(buf, "XXXX");
	return buf;
}

Datum pgq_finish_varbuf(StringInfo buf)
{
	if (!buf) return (Datum)0;
	SET_VARSIZE(buf->data, buf->len);
	return PointerGetDatum(buf->data);
}


/*
 * Find a string in comma-separated list.
 *
 * It does not support space inside tokens.
 */
bool pgq_strlist_contains(const char *liststr, const char *str)
{
	int c, len = strlen(str);
	const char *p, *listpos = liststr;

loop:
	/* find string fragment, later check if actual token */
	p = strstr(listpos, str);
	if (p == NULL)
		return false;

	/* move listpos further */
	listpos = p + len;
	/* survive len=0 and avoid unnecessary compare */
	if (*listpos)
		listpos++;

	/* check previous symbol */
	if (p > liststr) {
		c = *(p - 1);
		if (!isspace(c) && c != ',')
			goto loop;
	}

	/* check following symbol */
	c = p[len];
	if (c != 0 && !isspace(c) && c != ',')
		goto loop;

	return true;
}

/*
 * quoting
 */

static void pgq_urlencode(StringInfo buf, const char *src)
{
	static const char hextbl[] = "0123456789abcdef";
	while (*src) {
		unsigned c = (unsigned char)*src++;
		if (c == ' ') {
			appendStringInfoCharMacro(buf, '+');
		} else if ((c >= '0' && c <= '9')
			   || (c >= 'A' && c <= 'Z')
			   || (c >= 'a' && c <= 'z')
			   || c == '_' || c == '.' || c == '-') {
			appendStringInfoCharMacro(buf, c);
		} else {
			appendStringInfoCharMacro(buf, '%');
			appendStringInfoCharMacro(buf, hextbl[c >> 4]);
			appendStringInfoCharMacro(buf, hextbl[c & 15]);
		}
	}
}

static void pgq_quote_literal(StringInfo buf, const char *src)
{
	const char *quoted = quote_literal_cstr(src);
	appendStringInfoString(buf, quoted);
	pfree((char*)quoted);
}

/*
 * pgq_quote_ident - Quote an identifier only if needed
 */
static void pgq_quote_ident(StringInfo buf, const char *src)
{
	const char *quoted = quote_identifier(src);
	appendStringInfoString(buf, quoted);
	if (quoted != src)
		pfree((char *)quoted);
}

#if PG_VERSION_NUM < 90200

static void escape_json(StringInfo buf, const char *p)
{
	appendStringInfoCharMacro(buf, '\"');
	for (; *p; p++) {
		switch (*p) {
		case '\b': appendStringInfoString(buf, "\\b"); break;
		case '\f': appendStringInfoString(buf, "\\f"); break;
		case '\n': appendStringInfoString(buf, "\\n"); break;
		case '\r': appendStringInfoString(buf, "\\r"); break;
		case '\t': appendStringInfoString(buf, "\\t"); break;
		case '"': appendStringInfoString(buf, "\\\""); break;
		case '\\': appendStringInfoString(buf, "\\\\"); break;
		default:
			   if ((unsigned char) *p < ' ')
				   appendStringInfo(buf, "\\u%04x", (int) *p);
			   else
				   appendStringInfoCharMacro(buf, *p);
			   break;
		}
	}
	appendStringInfoCharMacro(buf, '\"');
}

#endif

void pgq_encode_cstring(StringInfo tbuf, const char *str, enum PgqEncode encoding)
{
	if (str == NULL)
		elog(ERROR, "tbuf_encode_cstring: NULL");

	switch (encoding) {
	case TBUF_QUOTE_LITERAL:
		pgq_quote_literal(tbuf, str);
		break;

	case TBUF_QUOTE_IDENT:
		pgq_quote_ident(tbuf, str);
		break;

	case TBUF_QUOTE_URLENC:
		pgq_urlencode(tbuf, str);
		break;

	case TBUF_QUOTE_JSON:
		escape_json(tbuf, str);
		break;

	default:
		elog(ERROR, "bad encoding");
	}
}