ucx: ucx/properties.c@d2b1e67b2b48

     1 /*

     2  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.

     3  *

     4  * Copyright 2013 Olaf Wintermann. All rights reserved.

     5  *

     6  * Redistribution and use in source and binary forms, with or without

     7  * modification, are permitted provided that the following conditions are met:

     8  *

     9  *   1. Redistributions of source code must retain the above copyright

    10  *      notice, this list of conditions and the following disclaimer.

    11  *

    12  *   2. Redistributions in binary form must reproduce the above copyright

    13  *      notice, this list of conditions and the following disclaimer in the

    14  *      documentation and/or other materials provided with the distribution.

    15  *

    16  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"

    17  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

    18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

    19  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE

    20  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR

    21  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF

    22  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS

    23  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN

    24  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)

    25  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE

    26  * POSSIBILITY OF SUCH DAMAGE.

    27  */

    29 #include <stdio.h>

    30 #include <stdlib.h>

    31 #include <string.h>

    33 #include "properties.h"

    35 UcxPropParser *ucx_prop_new() {

    36     UcxPropParser *parser = (UcxPropParser*)malloc(

    37             sizeof(UcxPropParser));

    38     if(!parser) {

    39         return NULL;

    40     }

    42     parser->buffer = NULL;

    43     parser->buflen = 0;

    44     parser->pos = 0;

    45     parser->tmp = NULL;

    46     parser->tmplen = 0;

    47     parser->tmpcap = 0;

    48     parser->delimiter = '=';

    49     parser->comment1 = '#';

    50     parser->comment2 = 0;

    51     parser->comment3 = 0;

    53     return parser;

    54 }

    56 void ucx_prop_free(UcxPropParser *parser) {

    57     if(parser->tmp) {

    58         free(parser->tmp);

    59     }

    60     free(parser);

    61 }

    63 void ucx_prop_fill(UcxPropParser *parser, char *buf, size_t len) {

    64     parser->buffer = buf;

    65     parser->buflen = len;

    66     parser->pos = 0;

    67 }

    69 static void parser_tmp_append(UcxPropParser *parser, char *buf, size_t len) {

    70     if(parser->tmpcap - parser->tmplen < len) {

    71         size_t newcap = parser->tmpcap + len + 64;

    72         parser->tmp = (char*)realloc(parser->tmp, newcap);

    73         parser->tmpcap = newcap;

    74     }

    75     memcpy(parser->tmp + parser->tmplen, buf, len);

    76     parser->tmplen += len;

    77 }

    79 int ucx_prop_parse(UcxPropParser *parser, sstr_t *name, sstr_t *value)  {

    80     if(parser->tmplen > 0) {

    81         char *buf = parser->buffer + parser->pos;

    82         size_t len = parser->buflen - parser->pos;

    83         sstr_t str = sstrn(buf, len);

    84         sstr_t nl = sstrchr(str, '\n');

    85         if(nl.ptr) {

    86             size_t newlen = (size_t)(nl.ptr - buf) + 1;

    87             parser_tmp_append(parser, buf, newlen);

    88             // the tmp buffer contains exactly one line now

    90             char *orig_buf = parser->buffer;

    91             size_t orig_len = parser->buflen;

    93             parser->buffer = parser->tmp;

    94             parser->buflen = parser->tmplen;

    95             parser->pos = 0;

    96             parser->tmp = NULL;

    97             parser->tmpcap = 0;

    98             parser->tmplen = 0;

    99             // run parse with the tmp buffer as main buffer

   100             int ret = ucx_prop_parse(parser, name, value);

   102             // restore original buffer

   103             parser->tmp = parser->buffer;

   104             parser->buffer = orig_buf;

   105             parser->buflen = orig_len;

   106             parser->pos = newlen;

   108             /*

   109              * if ret == 0 the tmp buffer contained just space or comment

   110              * we parse again with the original buffer to get a name/value

   111              * or a new tmp buffer

   112              */

   113             return ret ? ret : ucx_prop_parse(parser, name, value);

   114         } else {

   115             parser_tmp_append(parser, buf, len);

   116             return 0;

   117         }

   118     } else if(parser->tmp) {

   119         free(parser->tmp);

   120         parser->tmp = NULL;

   121     }

   123     char comment1 = parser->comment1;

   124     char comment2 = parser->comment2;

   125     char comment3 = parser->comment3;

   126     char delimiter = parser->delimiter;

   128     // get one line and parse it

   129     while(1) {

   130         if(parser->pos >= parser->buflen) {

   131             return 0;

   132         }

   133         char *buf = parser->buffer + parser->pos;

   134         size_t len = parser->buflen - parser->pos;

   136         /*

   137          * First we check if we have at least one line. We also get indices of

   138          * delimiter and comment chars

   139          */

   140         size_t delimiter_index = 0;

   141         size_t comment_index = 0;

   142         int has_comment = 0;

   144         size_t i = 0;

   145         char c = 0;

   146         for(;i<len;i++) {

   147             c = buf[i];

   148             if(c == comment1 || c == comment2 || c == comment3) {

   149                 if(comment_index == 0) {

   150                     comment_index = i;

   151                     has_comment = 1;

   152                 }

   153             } else if(c == delimiter) {

   154                 if(delimiter_index == 0 && !has_comment) {

   155                     delimiter_index = i;

   156                 }

   157             } else if(c == '\n') {

   158                 break;

   159             }

   160         }

   162         if(c != '\n') {

   163             // we have not enough data for a line

   164             // store remaining bytes in temporary buffer for next round

   165             parser->tmpcap = len + 128;

   166             parser->tmp = (char*)malloc(parser->tmpcap);

   167             parser->tmplen = len;

   168             memcpy(parser->tmp, buf, len);

   169             return 0;

   170         }

   172         sstr_t line = has_comment ? sstrn(buf, comment_index) : sstrn(buf, i);

   173         // check line

   174         if(delimiter_index == 0) {

   175             line = sstrtrim(line);

   176             if(line.length != 0) {

   177                 // syntax error

   178                 // TODO

   179             }

   180             parser->pos += i + 1;

   181             continue;

   182         }

   184         sstr_t n = sstrn(buf, delimiter_index);

   185         sstr_t v = sstrn(buf + delimiter_index + 1, i - delimiter_index - 1);

   186         n = sstrtrim(n);

   187         v = sstrtrim(v);

   188         if(n.length == 0 || v.length == 0) {

   189             // syntax error

   190             // TODO

   191             parser->pos += i + 1;

   192             continue;

   193         }

   195         *name = n;

   196         *value = v;

   198         parser->pos += i + 1;

   199         break;

   200     }

   202     return 1;

   203 }

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