Commit | Line | Data |
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0f2a8846 | 1 | /* -*-c-*- |
2 | * | |
0f2a8846 | 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" | |
36 | #include "url.h" | |
37 | ||
38 | /*----- Main code ---------------------------------------------------------*/ | |
39 | ||
40 | /* --- @url_initenc@ --- * | |
41 | * | |
42 | * Arguments: @url_ectx *ctx@ = pointer to context block | |
43 | * | |
44 | * Returns: --- | |
45 | * | |
46 | * Use: Initializes a URL encoding context. | |
47 | */ | |
48 | ||
0ddebb8f | 49 | void url_initenc(url_ectx *ctx) { ctx->f = 0; } |
0f2a8846 | 50 | |
51 | /* --- @encode@ --- * | |
52 | * | |
7e4708e4 MW |
53 | * Arguments: @url_ectx *ctx@ = encoding context |
54 | * @dstr *d@ = pointer to output string | |
0f2a8846 | 55 | * @const char *p@ = pointer to thing to encode |
56 | * | |
57 | * Returns: --- | |
58 | * | |
59 | * Use: Encodes the input string into the output string. | |
60 | */ | |
61 | ||
7e4708e4 | 62 | static void encode(url_ectx *ctx, dstr *d, const char *p) |
0f2a8846 | 63 | { |
64 | while (*p) { | |
65 | switch (*p) { | |
96e10f28 | 66 | case ' ': DPUTC(d, '+'); |
d4efbcd9 | 67 | break; |
0f2a8846 | 68 | default: |
96e10f28 | 69 | if (isspace((unsigned char)*p)) goto unsafe; |
962e9e9c | 70 | else if (isalnum((unsigned char)*p)) goto safe; |
96e10f28 MW |
71 | else if (ctx->f&URLF_LAX) goto safe; |
72 | else goto unsafe; | |
73 | case '/': case '~': | |
74 | if (ctx->f&URLF_STRICT) goto unsafe; /* else fall through... */ | |
75 | safe: case '-': case '.': case '_': | |
76 | DPUTC(d, *p); break; | |
77 | unsafe: case '+': case '%': case '=': case '&': case ';': | |
78 | dstr_putf(d, "%%%02x", *p); break; | |
0f2a8846 | 79 | } |
80 | p++; | |
81 | } | |
82 | } | |
83 | ||
84 | /* --- @url_enc@ --- * | |
85 | * | |
86 | * Arguments: @url_ectx *ctx@ = pointer to encoding context | |
87 | * @dstr *d@ = pointer to output string | |
88 | * @const char *name@ = pointer to name | |
89 | * @const char *value@ = pointer to value | |
90 | * | |
91 | * Returns: --- | |
92 | * | |
93 | * Use: Writes an assignment between @name@ and @value@ to the | |
94 | * output string, encoding the values properly. | |
95 | */ | |
96 | ||
97 | void url_enc(url_ectx *ctx, dstr *d, const char *name, const char *value) | |
98 | { | |
99 | if (ctx->f & URLF_SEP) | |
9dc511e4 | 100 | DPUTC(d, (ctx->f & URLF_SEMI) ? ';' : '&'); |
7e4708e4 | 101 | encode(ctx, d, name); |
0f2a8846 | 102 | DPUTC(d, '='); |
7e4708e4 | 103 | encode(ctx, d, value); |
0f2a8846 | 104 | DPUTZ(d); |
105 | ctx->f |= URLF_SEP; | |
106 | } | |
107 | ||
108 | /* --- @url_initdec@ --- * | |
109 | * | |
110 | * Arguments: @url_dctx *ctx@ = pointer to context block | |
111 | * @const char *p@ = string to read data from | |
112 | * | |
113 | * Returns: --- | |
114 | * | |
115 | * Use: Initializes a URL decoding context. | |
116 | */ | |
117 | ||
9dc511e4 | 118 | void url_initdec(url_dctx *ctx, const char *p) { ctx->p = p; ctx->f = 0; } |
0f2a8846 | 119 | |
120 | /* --- @decode@ --- * | |
121 | * | |
9dc511e4 MW |
122 | * Arguments: @url_dctx *ctx@ = pointer to the context |
123 | * @dstr *d@ = pointer to output string | |
0f2a8846 | 124 | * @const char *p@ = pointer to input data |
125 | * @int eq@ = whether to stop at `=' characters | |
126 | * | |
127 | * Returns: Pointer to next available character. | |
128 | * | |
129 | * Use: Does a URL decode. | |
130 | */ | |
131 | ||
9dc511e4 | 132 | static const char *decode(url_dctx *ctx, dstr *d, const char *p, int eq) |
0f2a8846 | 133 | { |
134 | if (!*p) | |
135 | return (0); | |
136 | for (;;) { | |
137 | switch (*p) { | |
138 | case '=': | |
139 | if (eq) | |
140 | return (p); | |
9dc511e4 MW |
141 | goto boring; |
142 | case ';': | |
143 | if (ctx->f & URLF_SEMI) | |
144 | return (p); | |
145 | goto boring; | |
0f2a8846 | 146 | case 0: |
147 | case '&': | |
148 | return (p); | |
149 | case '+': | |
150 | DPUTC(d, ' '); | |
151 | break; | |
152 | case '%': { | |
153 | unsigned int ch; | |
154 | int n; | |
155 | int x = sscanf(p + 1, "%2x%n", &ch, &n); | |
156 | if (x == 1) { | |
157 | DPUTC(d, ch); | |
158 | p += n; | |
159 | break; | |
160 | } | |
161 | } | |
162 | default: | |
9dc511e4 | 163 | boring: |
0f2a8846 | 164 | DPUTC(d, *p); |
165 | break; | |
166 | } | |
167 | p++; | |
168 | } | |
169 | } | |
170 | ||
171 | /* --- @url_dec@ --- * | |
172 | * | |
173 | * Arguments: @url_dctx *ctx@ = pointer to decode context | |
174 | * @dstr *n@ = pointer to output string for name | |
175 | * @dstr *v@ = pointer to output string for value | |
176 | * | |
177 | * Returns: Nonzero if it read something, zero if there's nothing left | |
178 | * | |
179 | * Use: Decodes the next name/value pair from a urlencoded string. | |
180 | */ | |
181 | ||
182 | int url_dec(url_dctx *ctx, dstr *n, dstr *v) | |
183 | { | |
184 | const char *p = ctx->p; | |
185 | size_t l = n->len; | |
186 | ||
187 | again: | |
9dc511e4 | 188 | if ((p = decode(ctx, n, p, 1)) == 0 || *p == 0) |
0f2a8846 | 189 | return (0); |
190 | if (*p != '=') { | |
191 | p++; | |
192 | n->len = l; | |
193 | goto again; | |
194 | } | |
195 | p++; | |
9dc511e4 | 196 | if ((p = decode(ctx, v, p, 0)) == 0) |
0f2a8846 | 197 | return (0); |
198 | DPUTZ(n); | |
199 | DPUTZ(v); | |
200 | ctx->p = p; | |
201 | return (1); | |
202 | } | |
203 | ||
204 | /*----- That's all, folks -------------------------------------------------*/ |