diff options
Diffstat (limited to 'common/config-parser.c')
| -rw-r--r-- | common/config-parser.c | 270 |
1 files changed, 270 insertions, 0 deletions
diff --git a/common/config-parser.c b/common/config-parser.c new file mode 100644 index 0000000..5c1aa98 --- /dev/null +++ b/common/config-parser.c @@ -0,0 +1,270 @@ +/* + * Copyright (c) 2005, Nate Nielsen + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * * Redistributions of source code must retain the above + * copyright notice, this list of conditions and the + * following disclaimer. + * * Redistributions in binary form must reproduce the + * above copyright notice, this list of conditions and + * the following disclaimer in the documentation and/or + * other materials provided with the distribution. + * * The names of contributors to this software may not be + * used to endorse or promote products derived from this + * software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS + * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE + * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, + * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS + * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED + * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, + * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF + * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH + * DAMAGE. + * + * + * CONTRIBUTORS + * Nate Nielsen <nielsen@memberwebs.com> + */ + +#include "usuals.h" +#include <errno.h> +#include <unistd.h> +#include <syslog.h> +#include <stdarg.h> +#include <dirent.h> + +#include "config-parser.h" + +static void +errmsg(const char* filename, void* data, const char* msg, ...) +{ + #define MAX_MSGLEN 1024 + char buf[MAX_MSGLEN]; + va_list ap; + + va_start(ap, msg); + vsnprintf(buf, MAX_MSGLEN, msg, ap); + buf[MAX_MSGLEN - 1] = 0; + cfg_error(filename, buf, data); + va_end(ap); +} + +/* ----------------------------------------------------------------------------- + * CONFIG PARSER + */ + +static char* +read_config_file(const char* configfile, void* data) +{ + char* config = NULL; + FILE* f = NULL; + long len; + + ASSERT(configfile); + + f = fopen(configfile, "r"); + if(f == NULL) + { + errmsg(configfile, data, "couldn't open config file: %s", configfile); + return NULL; + } + + /* Figure out size */ + if(fseek(f, 0, SEEK_END) == -1 || (len = ftell(f)) == -1 || fseek(f, 0, SEEK_SET) == -1) + { + errmsg(configfile, data, "couldn't seek config file: %s", configfile); + return NULL; + } + + if((config = (char*)malloc(len + 2)) == NULL) + { + errmsg(configfile, data, "out of memory"); + return NULL; + } + + /* And read in one block */ + if(fread(config, 1, len, f) != len) + { + errmsg(configfile, data, "couldn't read config file: %s", configfile); + return NULL; + } + + fclose(f); + + /* Null terminate the data */ + config[len] = '\n'; + config[len + 1] = 0; + + /* Remove nasty dos line endings */ + strcln(config, '\r'); + + return config; +} + +int +cfg_parse_file(const char* filename, void* data, char** memory) +{ + char* name = NULL; + char* value = NULL; + char* config; + char* next; + char* header; + int ret = -1; + char* p; + char* t; + int pos; + + ASSERT(filename); + + config = read_config_file(filename, data); + next = config; + + /* Go through lines and process them */ + while((t = strchr(next, '\n')) != NULL) + { + *t = 0; + p = next; /* Do this before cleaning below */ + next = t + 1; + + t = strbtrim(p); + + /* Continuation line (had spaces at start) */ + if(p < t && *t) + { + if(!value) + { + errmsg(filename, data, "%s: invalid continuation in config: %s", + filename, p); + goto finally; + } + + /* Calculate the end of the current value */ + t = value + strlen(value); + ASSERT(t < p); + + /* Continuations are separated by spaces */ + *t = ' '; + t++; + + continue; + } + + /* No continuation hand off value if necessary */ + if(name && value) + { + if(cfg_value(filename, header, name, value, data) == -1) + goto finally; + } + + name = NULL; + value = NULL; + + /* Empty lines / comments at start / comments without continuation */ + if(!*t || *p == '#') + continue; + + /* A header */ + if(*p == '[') + { + t = p + strcspn(p, "]"); + if(!*t || t == p + 1) + { + errmsg(filename, data, "%s: invalid config header: %s", + filename, p); + goto finally; + } + + *t = 0; + header = strtrim(p + 1); + continue; + } + + /* Look for the break between name = value on the same line */ + t = p + strcspn(p, ":="); + if(!*t) + { + errmsg(filename, data, "%s: invalid config line: %s", + filename, p); + goto finally; + } + + /* Null terminate and split value part */ + *t = 0; + t++; + + name = strtrim(p); + value = strtrim(t); + } + + if(name && value) + { + if(cfg_value(filename, header, name, value, data) == -1) + goto finally; + } + + ret = 0; + + +finally: + + if(!memory || ret != 0) + free(config); + else if(memory) + *memory = config; + + return ret; +} + +int +cfg_parse_dir(const char* dirname, void* data) +{ + char olddir[MAXPATHLEN]; + struct dirent* dire; + char *memory; + DIR* dir; + + ASSERT(dir != NULL); + + if(!getcwd(olddir, MAXPATHLEN)) + olddir[0] = 0; + + if(chdir(dirname) == -1) + errmsg(NULL, data, "couldn't list config directory: %s", dirname); + + dir = opendir("."); + if(!dir) + { + errmsg(NULL, data, "couldn't list config directory: %s", dirname); + return -1; + } + + while((dire = readdir(dir)) != NULL) + { + if(dire->d_type != DT_REG && dire->d_type != DT_LNK) + continue; + + /* Build a happy path name */ + cfg_parse_file(dire->d_name, data, &memory); + + /* We call it with blanks after files */ + if(cfg_value(dire->d_name, NULL, NULL, NULL, data) == -1) + break; + + /* Keep the memory around */ + if(memory) + atexitv(free, memory); + } + + closedir(dir); + + return 0; +} |