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/*
INI LIBRARY
Low level parsing functions
Copyright (C) Dmitri Pal <dpal@redhat.com> 2010
INI Library is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
INI Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with INI Library. If not, see <http://www.gnu.org/licenses/>.
*/
#define _GNU_SOURCE
#include <errno.h>
#include <string.h>
#include <ctype.h>
#include "config.h"
#include "trace.h"
#include "ini_parse.h"
#include "ini_defines.h"
#include "ini_config.h"
/* Reads a line from the file */
int read_line(FILE *file,
char *buf,
int read_size,
char **key, char **value,
int *length,
int *ext_error)
{
char *res;
int len;
char *buffer;
int i;
char *eq;
TRACE_FLOW_STRING("read_line", "Entry");
*ext_error = 0;
buffer = buf;
/* Get data from file */
res = fgets(buffer, read_size - 1, file);
if (res == NULL) {
TRACE_ERROR_STRING("Read nothing", "");
return RET_EOF;
}
/* Make sure the buffer is NULL terminated */
buffer[read_size - 1] = '\0';
len = strlen(buffer);
if (len == 0) {
TRACE_ERROR_STRING("Nothing was read.", "");
return RET_EMPTY;
}
/* Added \r just in case we deal with Windows in future */
if ((buffer[len - 1] != '\n') && (buffer[len - 1] != '\r')) {
TRACE_ERROR_STRING("String it too big!", "");
*ext_error = ERR_LONGDATA;
return RET_ERROR;
}
/* Ingnore comments */
if ((*buffer == ';') || (*buffer == '#')) {
TRACE_FLOW_STRING("Comment", buf);
return RET_COMMENT;
}
TRACE_INFO_STRING("BUFFER before trimming:", buffer);
/* Trucate trailing spaces and CRs */
/* Make sure not to step before the beginning */
while (len && isspace(buffer[len - 1])) {
buffer[len - 1] = '\0';
len--;
}
TRACE_INFO_STRING("BUFFER after trimming trailing spaces:", buffer);
/* Trucate leading spaces */
while (isspace(*buffer)) {
buffer++;
len--;
}
TRACE_INFO_STRING("BUFFER after trimming leading spaces:", buffer);
TRACE_INFO_NUMBER("BUFFER length:", len);
/* Empty line */
if (len == 0) {
TRACE_FLOW_STRING("Empty line", buf);
return RET_EMPTY;
}
/* Section */
if (*buffer == '[') {
if (buffer[len-1] != ']') {
TRACE_ERROR_STRING("Invalid format for section", buf);
*ext_error = ERR_NOCLOSESEC;
return RET_ERROR;
}
buffer++;
len--;
while (isspace(*buffer)) {
buffer++;
len--;
}
if (len == 0) {
TRACE_ERROR_STRING("Invalid format for section", buf);
*ext_error = ERR_NOSECTION;
return RET_ERROR;
}
buffer[len - 1] = '\0';
len--;
while (isspace(buffer[len - 1])) {
buffer[len - 1] = '\0';
len--;
}
if (len >= MAX_KEY) {
TRACE_ERROR_STRING("Section name is too long", buf);
*ext_error = ERR_SECTIONLONG;
return RET_ERROR;
}
*key = buffer;
return RET_SECTION;
}
/* Assume we are dealing with the K-V here */
/* Find "=" */
eq = strchr(buffer, '=');
if (eq == NULL) {
TRACE_ERROR_STRING("No equal sign", buf);
*ext_error = ERR_NOEQUAL;
return RET_INVALID;
}
len -= eq-buffer;
/* Strip spaces around "=" */
i = eq - buffer - 1;
while ((i >= 0) && isspace(buffer[i])) i--;
if (i < 0) {
TRACE_ERROR_STRING("No key", buf);
*ext_error = ERR_NOKEY;
return RET_INVALID;
}
/* Copy key into provided buffer */
if(i >= MAX_KEY) {
TRACE_ERROR_STRING("Section name is too long", buf);
*ext_error = ERR_LONGKEY;
return RET_INVALID;
}
*key = buffer;
buffer[i + 1] = '\0';
TRACE_INFO_STRING("KEY:", *key);
eq++;
len--;
while (isspace(*eq)) {
eq++;
len--;
}
*value = eq;
/* Make sure we include trailing 0 into data */
*length = len + 1;
TRACE_INFO_STRING("VALUE:", *value);
TRACE_INFO_NUMBER("LENGTH:", *length);
TRACE_FLOW_STRING("read_line", "Exit");
return RET_PAIR;
}
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