Commit | Line | Data |
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0f2a8846 | 1 | /* -*-c-*- |
0f2a8846 | 2 | * |
3 | * Parsing and construction of url-encoded name/value pairs | |
4 | * | |
5 | * (c) 1999 Straylight/Edgeware | |
6 | */ | |
7 | ||
d4efbcd9 | 8 | /*----- Licensing notice --------------------------------------------------* |
0f2a8846 | 9 | * |
10 | * This file is part of the mLib utilities library. | |
11 | * | |
12 | * mLib is free software; you can redistribute it and/or modify | |
13 | * it under the terms of the GNU Library General Public License as | |
14 | * published by the Free Software Foundation; either version 2 of the | |
15 | * License, or (at your option) any later version. | |
d4efbcd9 | 16 | * |
0f2a8846 | 17 | * mLib is distributed in the hope that it will be useful, |
18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
20 | * GNU Library General Public License for more details. | |
d4efbcd9 | 21 | * |
0f2a8846 | 22 | * You should have received a copy of the GNU Library General Public |
23 | * License along with mLib; if not, write to the Free | |
24 | * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, | |
25 | * MA 02111-1307, USA. | |
26 | */ | |
27 | ||
0f2a8846 | 28 | /*----- Header files ------------------------------------------------------*/ |
29 | ||
78b1464e | 30 | #include <ctype.h> |
0f2a8846 | 31 | #include <stdio.h> |
32 | #include <stdlib.h> | |
33 | #include <string.h> | |
34 | ||
35 | #include "dstr.h" | |
36188114 | 36 | #include "macros.h" |
0f2a8846 | 37 | #include "url.h" |
38 | ||
39 | /*----- Main code ---------------------------------------------------------*/ | |
40 | ||
41 | /* --- @url_initenc@ --- * | |
42 | * | |
43 | * Arguments: @url_ectx *ctx@ = pointer to context block | |
44 | * | |
45 | * Returns: --- | |
46 | * | |
47 | * Use: Initializes a URL encoding context. | |
48 | */ | |
49 | ||
0ddebb8f | 50 | void url_initenc(url_ectx *ctx) { ctx->f = 0; } |
0f2a8846 | 51 | |
52 | /* --- @encode@ --- * | |
53 | * | |
7e4708e4 MW |
54 | * Arguments: @url_ectx *ctx@ = encoding context |
55 | * @dstr *d@ = pointer to output string | |
0f2a8846 | 56 | * @const char *p@ = pointer to thing to encode |
57 | * | |
58 | * Returns: --- | |
59 | * | |
60 | * Use: Encodes the input string into the output string. | |
61 | */ | |
62 | ||
7e4708e4 | 63 | static void encode(url_ectx *ctx, dstr *d, const char *p) |
0f2a8846 | 64 | { |
65 | while (*p) { | |
66 | switch (*p) { | |
96e10f28 | 67 | case ' ': DPUTC(d, '+'); |
d4efbcd9 | 68 | break; |
0f2a8846 | 69 | default: |
36188114 MW |
70 | if (ISSPACE(*p)) goto unsafe; |
71 | else if (ISALNUM(*p)) goto safe; | |
96e10f28 MW |
72 | else if (ctx->f&URLF_LAX) goto safe; |
73 | else goto unsafe; | |
74 | case '/': case '~': | |
75 | if (ctx->f&URLF_STRICT) goto unsafe; /* else fall through... */ | |
76 | safe: case '-': case '.': case '_': | |
77 | DPUTC(d, *p); break; | |
78 | unsafe: case '+': case '%': case '=': case '&': case ';': | |
79 | dstr_putf(d, "%%%02x", *p); break; | |
0f2a8846 | 80 | } |
81 | p++; | |
82 | } | |
83 | } | |
84 | ||
85 | /* --- @url_enc@ --- * | |
86 | * | |
87 | * Arguments: @url_ectx *ctx@ = pointer to encoding context | |
88 | * @dstr *d@ = pointer to output string | |
89 | * @const char *name@ = pointer to name | |
90 | * @const char *value@ = pointer to value | |
91 | * | |
92 | * Returns: --- | |
93 | * | |
94 | * Use: Writes an assignment between @name@ and @value@ to the | |
95 | * output string, encoding the values properly. | |
96 | */ | |
97 | ||
98 | void url_enc(url_ectx *ctx, dstr *d, const char *name, const char *value) | |
99 | { | |
100 | if (ctx->f & URLF_SEP) | |
9dc511e4 | 101 | DPUTC(d, (ctx->f & URLF_SEMI) ? ';' : '&'); |
7e4708e4 | 102 | encode(ctx, d, name); |
0f2a8846 | 103 | DPUTC(d, '='); |
7e4708e4 | 104 | encode(ctx, d, value); |
0f2a8846 | 105 | DPUTZ(d); |
106 | ctx->f |= URLF_SEP; | |
107 | } | |
108 | ||
109 | /* --- @url_initdec@ --- * | |
110 | * | |
111 | * Arguments: @url_dctx *ctx@ = pointer to context block | |
112 | * @const char *p@ = string to read data from | |
113 | * | |
114 | * Returns: --- | |
115 | * | |
116 | * Use: Initializes a URL decoding context. | |
117 | */ | |
118 | ||
9dc511e4 | 119 | void url_initdec(url_dctx *ctx, const char *p) { ctx->p = p; ctx->f = 0; } |
0f2a8846 | 120 | |
121 | /* --- @decode@ --- * | |
122 | * | |
9dc511e4 MW |
123 | * Arguments: @url_dctx *ctx@ = pointer to the context |
124 | * @dstr *d@ = pointer to output string | |
0f2a8846 | 125 | * @const char *p@ = pointer to input data |
126 | * @int eq@ = whether to stop at `=' characters | |
127 | * | |
128 | * Returns: Pointer to next available character. | |
129 | * | |
130 | * Use: Does a URL decode. | |
131 | */ | |
132 | ||
9dc511e4 | 133 | static const char *decode(url_dctx *ctx, dstr *d, const char *p, int eq) |
0f2a8846 | 134 | { |
135 | if (!*p) | |
136 | return (0); | |
137 | for (;;) { | |
138 | switch (*p) { | |
139 | case '=': | |
140 | if (eq) | |
141 | return (p); | |
9dc511e4 MW |
142 | goto boring; |
143 | case ';': | |
144 | if (ctx->f & URLF_SEMI) | |
145 | return (p); | |
146 | goto boring; | |
0f2a8846 | 147 | case 0: |
148 | case '&': | |
149 | return (p); | |
150 | case '+': | |
151 | DPUTC(d, ' '); | |
152 | break; | |
153 | case '%': { | |
154 | unsigned int ch; | |
155 | int n; | |
156 | int x = sscanf(p + 1, "%2x%n", &ch, &n); | |
157 | if (x == 1) { | |
158 | DPUTC(d, ch); | |
159 | p += n; | |
160 | break; | |
161 | } | |
162 | } | |
163 | default: | |
9dc511e4 | 164 | boring: |
0f2a8846 | 165 | DPUTC(d, *p); |
166 | break; | |
167 | } | |
168 | p++; | |
169 | } | |
170 | } | |
171 | ||
172 | /* --- @url_dec@ --- * | |
173 | * | |
174 | * Arguments: @url_dctx *ctx@ = pointer to decode context | |
175 | * @dstr *n@ = pointer to output string for name | |
176 | * @dstr *v@ = pointer to output string for value | |
177 | * | |
178 | * Returns: Nonzero if it read something, zero if there's nothing left | |
179 | * | |
180 | * Use: Decodes the next name/value pair from a urlencoded string. | |
181 | */ | |
182 | ||
183 | int url_dec(url_dctx *ctx, dstr *n, dstr *v) | |
184 | { | |
185 | const char *p = ctx->p; | |
186 | size_t l = n->len; | |
187 | ||
188 | again: | |
9dc511e4 | 189 | if ((p = decode(ctx, n, p, 1)) == 0 || *p == 0) |
0f2a8846 | 190 | return (0); |
191 | if (*p != '=') { | |
192 | p++; | |
193 | n->len = l; | |
194 | goto again; | |
195 | } | |
196 | p++; | |
9dc511e4 | 197 | if ((p = decode(ctx, v, p, 0)) == 0) |
0f2a8846 | 198 | return (0); |
199 | DPUTZ(n); | |
200 | DPUTZ(v); | |
201 | ctx->p = p; | |
202 | return (1); | |
203 | } | |
204 | ||
205 | /*----- That's all, folks -------------------------------------------------*/ |