| 1 | /* |
| 2 | ashd - A Sane HTTP Daemon |
| 3 | Copyright (C) 2008 Fredrik Tolf <fredrik@dolda2000.com> |
| 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 | |
| 19 | #ifdef HAVE_CONFIG_H |
| 20 | #include <config.h> |
| 21 | #endif |
| 22 | #include <stdlib.h> |
| 23 | #include <string.h> |
| 24 | #include <errno.h> |
| 25 | |
| 26 | #include <utils.h> |
| 27 | #include <bufio.h> |
| 28 | |
| 29 | struct bufio *bioopen(void *pdata, struct bufioops *ops) |
| 30 | { |
| 31 | struct bufio *bio; |
| 32 | |
| 33 | omalloc(bio); |
| 34 | bio->pdata = pdata; |
| 35 | bio->ops = ops; |
| 36 | bio->bufhint = 4096; |
| 37 | return(bio); |
| 38 | } |
| 39 | |
| 40 | int bioclose(struct bufio *bio) |
| 41 | { |
| 42 | int rv; |
| 43 | |
| 44 | bioflush(bio); |
| 45 | if(bio->ops->close) |
| 46 | rv = bio->ops->close(bio->pdata); |
| 47 | else |
| 48 | rv = 0; |
| 49 | buffree(bio->rbuf); |
| 50 | buffree(bio->wbuf); |
| 51 | free(bio); |
| 52 | return(rv); |
| 53 | } |
| 54 | |
| 55 | size_t biordata(struct bufio *bio) |
| 56 | { |
| 57 | return(bio->rbuf.d - bio->rh); |
| 58 | } |
| 59 | |
| 60 | size_t biorspace(struct bufio *bio) |
| 61 | { |
| 62 | if((bio->rbuf.d - bio->rh) >= bio->bufhint) |
| 63 | return(0); |
| 64 | return(bio->bufhint - (bio->rbuf.d - bio->rh)); |
| 65 | } |
| 66 | |
| 67 | int bioeof(struct bufio *bio) |
| 68 | { |
| 69 | return(bio->eof && (bio->rh >= bio->rbuf.d)); |
| 70 | } |
| 71 | |
| 72 | static ssize_t biofill(struct bufio *bio) |
| 73 | { |
| 74 | size_t ns; |
| 75 | ssize_t ret; |
| 76 | |
| 77 | if(!bio->ops->read) { |
| 78 | bio->eof = 1; |
| 79 | return(0); |
| 80 | } |
| 81 | if(bio->eof) |
| 82 | return(0); |
| 83 | if(bio->rh == bio->rbuf.d) |
| 84 | bio->rh = bio->rbuf.d = 0; |
| 85 | if(bio->rbuf.d == bio->rbuf.s) { |
| 86 | if(bio->rh > 0) { |
| 87 | memmove(bio->rbuf.b, bio->rbuf.b + bio->rh, bio->rbuf.d -= bio->rh); |
| 88 | bio->rh = 0; |
| 89 | } else { |
| 90 | if((ns = bio->rbuf.s * 2) < bio->bufhint) |
| 91 | ns = bio->bufhint; |
| 92 | sizebuf(bio->rbuf, ns); |
| 93 | } |
| 94 | } |
| 95 | if((bio->rbuf.s > bio->bufhint) && (bio->rbuf.d < bio->bufhint)) |
| 96 | bio->rbuf.b = srealloc(bio->rbuf.b, bio->rbuf.s = bio->bufhint); |
| 97 | ret = bio->ops->read(bio->pdata, bio->rbuf.b + bio->rbuf.d, bio->rbuf.s - bio->rbuf.d); |
| 98 | if(ret < 0) { |
| 99 | bio->err = errno; |
| 100 | return(-1); |
| 101 | } else if(ret == 0) { |
| 102 | bio->eof = 1; |
| 103 | return(0); |
| 104 | } |
| 105 | bio->rbuf.d += ret; |
| 106 | return(bio->rbuf.d - bio->rh); |
| 107 | } |
| 108 | |
| 109 | ssize_t biorensure(struct bufio *bio, size_t bytes) |
| 110 | { |
| 111 | ssize_t ret; |
| 112 | |
| 113 | while(bio->rbuf.d - bio->rh < bytes) { |
| 114 | if((ret = biofill(bio)) <= 0) |
| 115 | return(ret); |
| 116 | } |
| 117 | return(bio->rbuf.d - bio->rh); |
| 118 | } |
| 119 | |
| 120 | ssize_t biofillsome(struct bufio *bio) |
| 121 | { |
| 122 | return(biofill(bio)); |
| 123 | } |
| 124 | |
| 125 | int biogetc(struct bufio *bio) |
| 126 | { |
| 127 | ssize_t ret; |
| 128 | |
| 129 | while(bio->rbuf.d <= bio->rh) { |
| 130 | if((ret = biofill(bio)) <= 0) |
| 131 | return(EOF); |
| 132 | } |
| 133 | return((unsigned char)bio->rbuf.b[bio->rh++]); |
| 134 | } |
| 135 | |
| 136 | ssize_t bioreadsome(struct bufio *bio, void *buf, size_t len) |
| 137 | { |
| 138 | ssize_t ret; |
| 139 | |
| 140 | if((bio->rh >= bio->rbuf.d) && ((ret = biofill(bio)) <= 0)) |
| 141 | return(ret); |
| 142 | ret = min(len, bio->rbuf.d - bio->rh); |
| 143 | memcpy(buf, bio->rbuf.b + bio->rh, ret); |
| 144 | bio->rh += ret; |
| 145 | return(ret); |
| 146 | } |
| 147 | |
| 148 | size_t biowdata(struct bufio *bio) |
| 149 | { |
| 150 | return(bio->wbuf.d - bio->wh); |
| 151 | } |
| 152 | |
| 153 | size_t biowspace(struct bufio *bio) |
| 154 | { |
| 155 | if((bio->wbuf.d - bio->wh) >= bio->bufhint) |
| 156 | return(0); |
| 157 | return(bio->bufhint - (bio->wbuf.d - bio->wh)); |
| 158 | } |
| 159 | |
| 160 | int bioflush(struct bufio *bio) |
| 161 | { |
| 162 | ssize_t ret; |
| 163 | |
| 164 | while(bio->wh < bio->wbuf.d) { |
| 165 | ret = bio->ops->write(bio->pdata, bio->wbuf.b + bio->wh, bio->wbuf.d - bio->wh); |
| 166 | if(ret < 0) { |
| 167 | bio->err = errno; |
| 168 | return(-1); |
| 169 | } |
| 170 | bio->wh += ret; |
| 171 | } |
| 172 | return(0); |
| 173 | } |
| 174 | |
| 175 | int bioflushsome(struct bufio *bio) |
| 176 | { |
| 177 | ssize_t ret; |
| 178 | |
| 179 | if(bio->wh < bio->wbuf.d) { |
| 180 | ret = bio->ops->write(bio->pdata, bio->wbuf.b + bio->wh, bio->wbuf.d - bio->wh); |
| 181 | if(ret < 0) { |
| 182 | bio->err = errno; |
| 183 | return(-1); |
| 184 | } |
| 185 | bio->wh += ret; |
| 186 | return(1); |
| 187 | } else { |
| 188 | return(0); |
| 189 | } |
| 190 | } |
| 191 | |
| 192 | ssize_t biowensure(struct bufio *bio, size_t bytes) |
| 193 | { |
| 194 | if(bio->wbuf.s - bio->wbuf.d < bytes) { |
| 195 | if(!bio->ops->write) { |
| 196 | errno = bio->err = EPIPE; |
| 197 | return(-1); |
| 198 | } |
| 199 | if(bioflush(bio) < 0) |
| 200 | return(-1); |
| 201 | bio->wh = bio->wbuf.d = 0; |
| 202 | if((bio->wbuf.s > bio->bufhint) && (bytes <= bio->bufhint)) |
| 203 | bio->wbuf.b = srealloc(bio->wbuf.b, bio->wbuf.s = bio->bufhint); |
| 204 | else |
| 205 | sizebuf(bio->wbuf, (bytes < bio->bufhint)?bio->bufhint:bytes); |
| 206 | } |
| 207 | return(0); |
| 208 | } |
| 209 | |
| 210 | int bioputc(struct bufio *bio, int c) |
| 211 | { |
| 212 | if(biowensure(bio, 1) < 0) |
| 213 | return(-1); |
| 214 | bio->wbuf.b[bio->wbuf.d++] = c; |
| 215 | return(0); |
| 216 | } |
| 217 | |
| 218 | ssize_t biowrite(struct bufio *bio, const void *data, size_t len) |
| 219 | { |
| 220 | ssize_t wb, ret; |
| 221 | |
| 222 | wb = 0; |
| 223 | while(len > 0) { |
| 224 | if(biowensure(bio, min(len, bio->bufhint)) < 0) { |
| 225 | if(wb > 0) |
| 226 | return(wb); |
| 227 | return(-1); |
| 228 | } |
| 229 | if(len < bio->wbuf.s - bio->wbuf.d) { |
| 230 | memcpy(bio->wbuf.b + bio->wbuf.d, data, len); |
| 231 | bio->wbuf.d += len; |
| 232 | wb += len; |
| 233 | len = 0; |
| 234 | } else { |
| 235 | if(bioflush(bio) < 0) { |
| 236 | if(wb > 0) |
| 237 | return(wb); |
| 238 | return(-1); |
| 239 | } |
| 240 | bio->wh = bio->wbuf.d = 0; |
| 241 | ret = bio->ops->write(bio->pdata, data, len); |
| 242 | if(ret < 0) { |
| 243 | if(wb > 0) |
| 244 | return(wb); |
| 245 | bio->err = errno; |
| 246 | return(-1); |
| 247 | } |
| 248 | data += ret; len -= ret; wb += ret; |
| 249 | } |
| 250 | } |
| 251 | return(wb); |
| 252 | } |
| 253 | |
| 254 | ssize_t biowritesome(struct bufio *bio, const void *data, size_t len) |
| 255 | { |
| 256 | ssize_t ret; |
| 257 | |
| 258 | sizebuf(bio->wbuf, bio->bufhint); |
| 259 | if(bio->wh == bio->wbuf.d) |
| 260 | bio->wh = bio->wbuf.d = 0; |
| 261 | if(bio->wbuf.d == bio->wbuf.s) { |
| 262 | if(bio->wh > 0) |
| 263 | memmove(bio->wbuf.b, bio->wbuf.b + bio->wh, bio->wbuf.d -= bio->wh); |
| 264 | } |
| 265 | ret = min(len, bio->wbuf.s - bio->wbuf.d); |
| 266 | memcpy(bio->wbuf.b + bio->wbuf.d, data, ret); |
| 267 | bio->wbuf.d += ret; |
| 268 | if((bioflushsome(bio) < 0) && (ret == 0)) |
| 269 | return(-1); |
| 270 | return(ret); |
| 271 | } |
| 272 | |
| 273 | int bioprintf(struct bufio *bio, const char *format, ...) |
| 274 | { |
| 275 | va_list args; |
| 276 | int ret; |
| 277 | |
| 278 | if(biowensure(bio, strlen(format)) < 0) |
| 279 | return(-1); |
| 280 | while(1) { |
| 281 | va_start(args, format); |
| 282 | ret = vsnprintf(bio->wbuf.b + bio->wbuf.d, bio->wbuf.s - bio->wbuf.d, format, args); |
| 283 | va_end(args); |
| 284 | if(ret <= bio->wbuf.s - bio->wbuf.d) { |
| 285 | bio->wbuf.d += ret; |
| 286 | return(0); |
| 287 | } |
| 288 | if(biowensure(bio, ret) < 0) |
| 289 | return(-1); |
| 290 | } |
| 291 | } |
| 292 | |
| 293 | ssize_t biocopysome(struct bufio *dst, struct bufio *src) |
| 294 | { |
| 295 | ssize_t ret; |
| 296 | |
| 297 | if(src->rh >= src->rbuf.d) |
| 298 | return(0); |
| 299 | if((ret = biowritesome(dst, src->rbuf.b + src->rh, src->rbuf.d - src->rh)) < 0) |
| 300 | return(-1); |
| 301 | src->rh += ret; |
| 302 | return(ret); |
| 303 | } |