| 1 | /* |
| 2 | * This file is part of DisOrder. |
| 3 | * Copyright (C) 2004, 2005, 2007, 2008 Richard Kettlewell |
| 4 | * |
| 5 | * This program is free software: you can redistribute it and/or modify |
| 6 | * it under the terms of the GNU General Public License as published by |
| 7 | * the Free Software Foundation, either version 3 of the License, or |
| 8 | * (at your option) any later version. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * GNU General Public License for more details. |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License |
| 16 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 17 | */ |
| 18 | /** @file lib/kvp.c |
| 19 | * @brief Linked list of key-value pairs |
| 20 | * |
| 21 | * Also supports URL encoding/decoding (of raw strings and kvp lists). |
| 22 | * |
| 23 | * For large sets of keys, see @ref lib/hash.c. |
| 24 | */ |
| 25 | |
| 26 | #include "common.h" |
| 27 | |
| 28 | #include "mem.h" |
| 29 | #include "kvp.h" |
| 30 | #include "log.h" |
| 31 | #include "vector.h" |
| 32 | #include "hex.h" |
| 33 | #include "sink.h" |
| 34 | |
| 35 | int urldecode(struct sink *sink, const char *ptr, size_t n) { |
| 36 | int c, d1, d2; |
| 37 | |
| 38 | while(n-- > 0) { |
| 39 | switch(c = *ptr++) { |
| 40 | case '%': |
| 41 | if((d1 = unhexdigit(ptr[0])) == -1 |
| 42 | || (d2 = unhexdigit(ptr[1])) == -1) |
| 43 | return -1; |
| 44 | c = d1 * 16 + d2; |
| 45 | ptr += 2; |
| 46 | n -= 2; |
| 47 | break; |
| 48 | case '+': |
| 49 | c = ' '; |
| 50 | break; |
| 51 | default: |
| 52 | break; |
| 53 | } |
| 54 | if(sink_writec(sink,c) < 0) |
| 55 | return -1; |
| 56 | } |
| 57 | return 0; |
| 58 | } |
| 59 | |
| 60 | static char *decode(const char *ptr, size_t n) { |
| 61 | struct dynstr d; |
| 62 | struct sink *s; |
| 63 | |
| 64 | dynstr_init(&d); |
| 65 | s = sink_dynstr(&d); |
| 66 | if(urldecode(s, ptr, n)) |
| 67 | return 0; |
| 68 | dynstr_terminate(&d); |
| 69 | return d.vec; |
| 70 | } |
| 71 | |
| 72 | struct kvp *kvp_urldecode(const char *ptr, size_t n) { |
| 73 | struct kvp *kvp, **kk = &kvp, *k; |
| 74 | const char *q, *r, *top = ptr + n, *next; |
| 75 | |
| 76 | while(ptr < top) { |
| 77 | *kk = k = xmalloc(sizeof *k); |
| 78 | if(!(q = memchr(ptr, '=', top - ptr))) |
| 79 | break; |
| 80 | if(!(k->name = decode(ptr, q - ptr))) break; |
| 81 | if((r = memchr(ptr, '&', top - ptr))) |
| 82 | next = r + 1; |
| 83 | else |
| 84 | next = r = top; |
| 85 | if(r < q) |
| 86 | break; |
| 87 | if(!(k->value = decode(q + 1, r - (q + 1)))) break; |
| 88 | kk = &k->next; |
| 89 | ptr = next; |
| 90 | } |
| 91 | *kk = 0; |
| 92 | return kvp; |
| 93 | } |
| 94 | |
| 95 | int urlencode(struct sink *sink, const char *s, size_t n) { |
| 96 | unsigned char c; |
| 97 | |
| 98 | while(n > 0) { |
| 99 | c = *s++; |
| 100 | n--; |
| 101 | switch(c) { |
| 102 | default: |
| 103 | if((c >= '0' && c <= '9') |
| 104 | || (c >= 'a' && c <= 'z') |
| 105 | || (c >= 'A' && c <= 'Z')) { |
| 106 | /* RFC2396 2.3 unreserved characters */ |
| 107 | case '-': |
| 108 | case '_': |
| 109 | case '.': |
| 110 | case '!': |
| 111 | case '~': |
| 112 | case '*': |
| 113 | case '\'': |
| 114 | case '(': |
| 115 | case ')': |
| 116 | /* additional unreserved characters */ |
| 117 | case '/': |
| 118 | if(sink_writec(sink, c) < 0) |
| 119 | return -1; |
| 120 | } else |
| 121 | if(sink_printf(sink, "%%%02x", (unsigned int)c) < 0) |
| 122 | return -1; |
| 123 | } |
| 124 | } |
| 125 | return 0; |
| 126 | } |
| 127 | |
| 128 | /** @brief URL-encode @p s |
| 129 | * @param s String to encode |
| 130 | * @return Encoded string |
| 131 | */ |
| 132 | char *urlencodestring(const char *s) { |
| 133 | struct dynstr d; |
| 134 | |
| 135 | dynstr_init(&d); |
| 136 | urlencode(sink_dynstr(&d), s, strlen(s)); |
| 137 | dynstr_terminate(&d); |
| 138 | return d.vec; |
| 139 | } |
| 140 | |
| 141 | /** @brief URL-decode @p s |
| 142 | * @param s String to decode |
| 143 | * @param ns Length of string |
| 144 | * @return Decoded string or NULL |
| 145 | */ |
| 146 | char *urldecodestring(const char *s, size_t ns) { |
| 147 | struct dynstr d; |
| 148 | |
| 149 | dynstr_init(&d); |
| 150 | if(urldecode(sink_dynstr(&d), s, ns)) |
| 151 | return NULL; |
| 152 | dynstr_terminate(&d); |
| 153 | return d.vec; |
| 154 | } |
| 155 | |
| 156 | char *kvp_urlencode(const struct kvp *kvp, size_t *np) { |
| 157 | struct dynstr d; |
| 158 | struct sink *sink; |
| 159 | |
| 160 | dynstr_init(&d); |
| 161 | sink = sink_dynstr(&d); |
| 162 | while(kvp) { |
| 163 | urlencode(sink, kvp->name, strlen(kvp->name)); |
| 164 | dynstr_append(&d, '='); |
| 165 | urlencode(sink, kvp->value, strlen(kvp->value)); |
| 166 | if((kvp = kvp->next)) |
| 167 | dynstr_append(&d, '&'); |
| 168 | |
| 169 | } |
| 170 | dynstr_terminate(&d); |
| 171 | if(np) |
| 172 | *np = d.nvec; |
| 173 | return d.vec; |
| 174 | } |
| 175 | |
| 176 | int kvp_set(struct kvp **kvpp, const char *name, const char *value) { |
| 177 | struct kvp *k, **kk; |
| 178 | |
| 179 | for(kk = kvpp; (k = *kk) && strcmp(name, k->name); kk = &k->next) |
| 180 | ; |
| 181 | if(k) { |
| 182 | if(value) { |
| 183 | if(strcmp(k->value, value)) { |
| 184 | k->value = xstrdup(value); |
| 185 | return 1; |
| 186 | } else |
| 187 | return 0; |
| 188 | } else { |
| 189 | *kk = k->next; |
| 190 | return 1; |
| 191 | } |
| 192 | } else { |
| 193 | if(value) { |
| 194 | *kk = k = xmalloc(sizeof *k); |
| 195 | k->name = xstrdup(name); |
| 196 | k->value = xstrdup(value); |
| 197 | return 1; |
| 198 | } else |
| 199 | return 0; |
| 200 | } |
| 201 | } |
| 202 | |
| 203 | const char *kvp_get(const struct kvp *kvp, const char *name) { |
| 204 | for(;kvp && strcmp(kvp->name, name); kvp = kvp->next) |
| 205 | ; |
| 206 | return kvp ? kvp->value : 0; |
| 207 | } |
| 208 | |
| 209 | struct kvp *kvp_make(const char *name, ...) { |
| 210 | const char *value; |
| 211 | struct kvp *kvp = 0, *k; |
| 212 | va_list ap; |
| 213 | |
| 214 | va_start(ap, name); |
| 215 | while(name) { |
| 216 | value = va_arg(ap, const char *); |
| 217 | k = xmalloc(sizeof *k); |
| 218 | k->name = name; |
| 219 | k->value = value ? xstrdup(value) : value; |
| 220 | k->next = kvp; |
| 221 | kvp = k; |
| 222 | name = va_arg(ap, const char *); |
| 223 | } |
| 224 | va_end(ap); |
| 225 | return kvp; |
| 226 | } |
| 227 | |
| 228 | /* |
| 229 | Local Variables: |
| 230 | c-basic-offset:2 |
| 231 | comment-column:40 |
| 232 | End: |
| 233 | */ |