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Man Pages

Manual Reference Pages  -  CFG_PARSE (3)


cfg_parse, cfg_get_next_opt, cfg_get_cur_opt, cfg_get_cur_arg, cfg_get_cur_idx - libcfg+ parsing



After a libcfg+ context is created and its flags are set (optional), one can initiate the parsing. This chapter provides information about the available parsing methods.

#include <cfg+.h>

int cfg_parse (const CFG_CONTEXT con);

int cfg_get_next_opt (const CFG_CONTEXT con);


These functions take a context as their only argument. Depending on the type of the context, either a file or a command line option will be processed. If the option just parsed matches one of the options in the option set (see~Options set~section) and the arguments of the parsed option are stored in memory and value is set to point to them. However, if the value of the relevant option in the option is set to NULL, the arguments will not be stored.

The main and only difference between the two functions is in the way they interpret the val field of the relevant option after a matching token was found in the token stream. The function cfg_get_next_opt() respects the value of this field and if it is not 0, returns the value upon a match. If the field is set to 0, the function proceeds to the next token without returning a value. In the case of cfg_parse(), val is ignored.

If an error occurs during parsing, the functions return a negative integer. This is why it is a good idea to set the val member of the cfg_option to a value equal or greater than 0. Detailed information about error codes as well as their descriptions can be found in the Error handling section.

At the end of parsing 0 is returned.


The following functions provide additional information about a matched option.

#include <cfg+.h>

char *cfg_get_cur_opt (const CFG_CONTEXT con);

char *cfg_get_cur_arg (const CFG_CONTEXT con);

int cfg_get_cur_idx (const CFG_CONTEXT con);


Use cfg_get_cur_opt() to get the name of the option being processed. Use cfg_get_cur_arg()to get the current argument. Finally, use cfg_get_cur_idx() to get the current offset in the parsing stream. If the context is associated with the command line, the value is the current offset in the argv array. If the context is associated with a configuration file, then depending on the value of CFG_FILE_LINE_POS_USAGE, it is either the current byte offset or line number in the file.


You can get library overview, table of contents and such additional information info from main libcfg+(3) manpage by typing "man libcfg+" on UNIX-based systems. Also use this command to get information about authors, homepage and license conditions.
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libcfg+ 0.6.2 CFG_PARSE (3) 17 February 2004

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