path: root/src/iniparser.c

/*-------------------------------------------------------------------------*/
/**
   @file    iniparser.c
   @author  N. Devillard
   @date    Mar 2000
   @version $Revision: 2.17 $
   @brief   Parser for ini files.
*/
/*--------------------------------------------------------------------------*/

/*
    $Id: iniparser.c,v 2.17 2007-05-27 13:03:43 ndevilla Exp $
    $Author: ndevilla $
    $Date: 2007-05-27 13:03:43 $
    $Revision: 2.17 $
*/

/*---------------------------------------------------------------------------
                                Includes
 ---------------------------------------------------------------------------*/

#include "iniparser.h"
#include "strlib.h"

#define ASCIILINESZ         1024
#define INI_INVALID_KEY     ((char*)-1)

/*---------------------------------------------------------------------------
                        Private to this module
 ---------------------------------------------------------------------------*/

/* Private: add an entry to the dictionary */
static void iniparser_add_entry(
    dictionary * d,
    char * sec,
    char * key,
    char * val)
{
    char longkey[2*ASCIILINESZ+1];

    /* Make a key as section:keyword */
    if (key!=NULL) {
        sprintf(longkey, "%s:%s", sec, key);
    } else {
        strcpy(longkey, sec);
    }

    /* Add (key,val) to dictionary */
    dictionary_set(d, longkey, val);
    return ;
}


/*-------------------------------------------------------------------------*/
/**
  @brief    Get number of sections in a dictionary
  @param    d   Dictionary to examine
  @return   int Number of sections found in dictionary

  This function returns the number of sections found in a dictionary.
  The test to recognize sections is done on the string stored in the
  dictionary: a section name is given as "section" whereas a key is
  stored as "section:key", thus the test looks for entries that do not
  contain a colon.

  This clearly fails in the case a section name contains a colon, but
  this should simply be avoided.

  This function returns -1 in case of error.
 */
/*--------------------------------------------------------------------------*/

int iniparser_getnsec(dictionary * d)
{
    int i ;
    int nsec ;

    if (d==NULL) return -1 ;
    nsec=0 ;
    for (i=0 ; i<d->size ; i++) {
        if (d->key[i]==NULL)
            continue ;
        if (strchr(d->key[i], ':')==NULL) {
            nsec ++ ;
        }
    }
    return nsec ;
}


/*-------------------------------------------------------------------------*/
/**
  @brief    Get name for section n in a dictionary.
  @param    d   Dictionary to examine
  @param    n   Section number (from 0 to nsec-1).
  @return   Pointer to char string

  This function locates the n-th section in a dictionary and returns
  its name as a pointer to a string statically allocated inside the
  dictionary. Do not free or modify the returned string!

  This function returns NULL in case of error.
 */
/*--------------------------------------------------------------------------*/

char * iniparser_getsecname(dictionary * d, int n)
{
    int i ;
    int foundsec ;

    if (d==NULL || n<0) return NULL ;
    foundsec=0 ;
    for (i=0 ; i<d->size ; i++) {
        if (d->key[i]==NULL)
            continue ;
        if (strchr(d->key[i], ':')==NULL) {
            foundsec++ ;
            if (foundsec>n)
                break ;
        }
    }
    if (foundsec<=n) {
        return NULL ;
    }
    return d->key[i] ;
}


/*-------------------------------------------------------------------------*/
/**
  @brief    Dump a dictionary to an opened file pointer.
  @param    d   Dictionary to dump.
  @param    f   Opened file pointer to dump to.
  @return   void

  This function prints out the contents of a dictionary, one element by
  line, onto the provided file pointer. It is OK to specify @c stderr
  or @c stdout as output files. This function is meant for debugging
  purposes mostly.
 */
/*--------------------------------------------------------------------------*/
void iniparser_dump(dictionary * d, FILE * f)
{
    int     i ;

    if (d==NULL || f==NULL) return ;
    for (i=0 ; i<d->size ; i++) {
        if (d->key[i]==NULL)
            continue ;
        if (d->val[i]!=NULL) {
            fprintf(f, "[%s]=[%s]\n", d->key[i], d->val[i]);
        } else {
            fprintf(f, "[%s]=UNDEF\n", d->key[i]);
        }
    }
    return ;
}

/*-------------------------------------------------------------------------*/
/**
  @brief    Save a dictionary to a loadable ini file
  @param    d   Dictionary to dump
  @param    f   Opened file pointer to dump to
  @return   void

  This function dumps a given dictionary into a loadable ini file.
  It is Ok to specify @c stderr or @c stdout as output files.
 */
/*--------------------------------------------------------------------------*/

void iniparser_dump_ini(dictionary * d, FILE * f)
{
    int     i, j ;
    char    keym[ASCIILINESZ+1];
    int     nsec ;
    char *  secname ;
    int     seclen ;

    if (d==NULL || f==NULL) return ;

    nsec = iniparser_getnsec(d);
    if (nsec<1) {
        /* No section in file: dump all keys as they are */
        for (i=0 ; i<d->size ; i++) {
            if (d->key[i]==NULL)
                continue ;
            fprintf(f, "%s = %s\n", d->key[i], d->val[i]);
        }
        return ;
    }
    for (i=0 ; i<nsec ; i++) {
        secname = iniparser_getsecname(d, i) ;
        seclen  = (int)strlen(secname);
        fprintf(f, "\n[%s]\n", secname);
        sprintf(keym, "%s:", secname);
        for (j=0 ; j<d->size ; j++) {
            if (d->key[j]==NULL)
                continue ;
            if (!strncmp(d->key[j], keym, seclen+1)) {
                fprintf(f,
                        "%-30s = %s\n",
                        d->key[j]+seclen+1,
                        d->val[j] ? d->val[j] : "");
            }
        }
    }
    fprintf(f, "\n");
    return ;
}




/*-------------------------------------------------------------------------*/
/**
  @brief	Get the string associated to a key, return NULL if not found
  @param    d   Dictionary to search
  @param    key Key string to look for
  @return   pointer to statically allocated character string, or NULL.

  This function queries a dictionary for a key. A key as read from an
  ini file is given as "section:key". If the key cannot be found,
  NULL is returned.
  The returned char pointer is pointing to a string allocated in
  the dictionary, do not free or modify it.

  This function is only provided for backwards compatibility with 
  previous versions of iniparser. It is recommended to use
  iniparser_getstring() instead.
 */
/*--------------------------------------------------------------------------*/
char * iniparser_getstr(dictionary * d, const char * key)
{
    return iniparser_getstring(d, key, NULL);
}


/*-------------------------------------------------------------------------*/
/**
  @brief    Get the string associated to a key
  @param    d       Dictionary to search
  @param    key     Key string to look for
  @param    def     Default value to return if key not found.
  @return   pointer to statically allocated character string

  This function queries a dictionary for a key. A key as read from an
  ini file is given as "section:key". If the key cannot be found,
  the pointer passed as 'def' is returned.
  The returned char pointer is pointing to a string allocated in
  the dictionary, do not free or modify it.
 */
/*--------------------------------------------------------------------------*/
char * iniparser_getstring(dictionary * d, const char * key, char * def)
{
    char * lc_key ;
    char * sval ;

    if (d==NULL || key==NULL)
        return def ;

    if (!(lc_key = strdup(strlwc(key)))) {
	    return NULL;
    }
    sval = dictionary_get(d, lc_key, def);
    free(lc_key);
    return sval ;
}



/*-------------------------------------------------------------------------*/
/**
  @brief    Get the string associated to a key, convert to an int
  @param    d Dictionary to search
  @param    key Key string to look for
  @param    notfound Value to return in case of error
  @return   integer

  This function queries a dictionary for a key. A key as read from an
  ini file is given as "section:key". If the key cannot be found,
  the notfound value is returned.

  Supported values for integers include the usual C notation
  so decimal, octal (starting with 0) and hexadecimal (starting with 0x)
  are supported. Examples:

  "42"      ->  42
  "042"     ->  34 (octal -> decimal)
  "0x42"    ->  66 (hexa  -> decimal)

  Warning: the conversion may overflow in various ways. Conversion is
  totally outsourced to strtol(), see the associated man page for overflow
  handling.

  Credits: Thanks to A. Becker for suggesting strtol()
 */
/*--------------------------------------------------------------------------*/
int iniparser_getint(dictionary * d, const char * key, int notfound)
{
    char    *   str ;

    str = iniparser_getstring(d, key, INI_INVALID_KEY);
    if (str==INI_INVALID_KEY) return notfound ;
    return (int)strtol(str, NULL, 0);
}


/*-------------------------------------------------------------------------*/
/**
  @brief    Get the string associated to a key, convert to a double
  @param    d Dictionary to search
  @param    key Key string to look for
  @param    notfound Value to return in case of error
  @return   double

  This function queries a dictionary for a key. A key as read from an
  ini file is given as "section:key". If the key cannot be found,
  the notfound value is returned.
 */
/*--------------------------------------------------------------------------*/
double iniparser_getdouble(dictionary * d, char * key, double notfound)
{
    char    *   str ;

    str = iniparser_getstring(d, key, INI_INVALID_KEY);
    if (str==INI_INVALID_KEY) return notfound ;
    return atof(str);
}



/*-------------------------------------------------------------------------*/
/**
  @brief    Get the string associated to a key, convert to a boolean
  @param    d Dictionary to search
  @param    key Key string to look for
  @param    notfound Value to return in case of error
  @return   integer

  This function queries a dictionary for a key. A key as read from an
  ini file is given as "section:key". If the key cannot be found,
  the notfound value is returned.

  A true boolean is found if one of the following is matched:

  - A string starting with 'y'
  - A string starting with 'Y'
  - A string starting with 't'
  - A string starting with 'T'
  - A string starting with '1'

  A false boolean is found if one of the following is matched:

  - A string starting with 'n'
  - A string starting with 'N'
  - A string starting with 'f'
  - A string starting with 'F'
  - A string starting with '0'

  The notfound value returned if no boolean is identified, does not
  necessarily have to be 0 or 1.
 */
/*--------------------------------------------------------------------------*/
int iniparser_getboolean(dictionary * d, const char * key, int notfound)
{
    char    *   c ;
    int         ret ;

    c = iniparser_getstring(d, key, INI_INVALID_KEY);
    if (c==INI_INVALID_KEY) return notfound ;
    if (c[0]=='y' || c[0]=='Y' || c[0]=='1' || c[0]=='t' || c[0]=='T') {
        ret = 1 ;
    } else if (c[0]=='n' || c[0]=='N' || c[0]=='0' || c[0]=='f' || c[0]=='F') {
        ret = 0 ;
    } else {
        ret = notfound ;
    }
    return ret;
}


/*-------------------------------------------------------------------------*/
/**
  @brief    Finds out if a given entry exists in a dictionary
  @param    ini     Dictionary to search
  @param    entry   Name of the entry to look for
  @return   integer 1 if entry exists, 0 otherwise

  Finds out if a given entry exists in the dictionary. Since sections
  are stored as keys with NULL associated values, this is the only way
  of querying for the presence of sections in a dictionary.
 */
/*--------------------------------------------------------------------------*/

int iniparser_find_entry(
    dictionary  *   ini,
    char        *   entry
)
{
    int found=0 ;
    if (iniparser_getstring(ini, entry, INI_INVALID_KEY)!=INI_INVALID_KEY) {
        found = 1 ;
    }
    return found ;
}



/*-------------------------------------------------------------------------*/
/**
  @brief    Set an entry in a dictionary.
  @param    ini     Dictionary to modify.
  @param    entry   Entry to modify (entry name)
  @param    val     New value to associate to the entry.
  @return   int 0 if Ok, -1 otherwise.

  If the given entry can be found in the dictionary, it is modified to
  contain the provided value. If it cannot be found, -1 is returned.
  It is Ok to set val to NULL.
 */
/*--------------------------------------------------------------------------*/

int iniparser_setstr(dictionary * ini, char * entry, char * val)
{
    dictionary_set(ini, strlwc(entry), val);
    return 0 ;
}

/*-------------------------------------------------------------------------*/
/**
  @brief    Delete an entry in a dictionary
  @param    ini     Dictionary to modify
  @param    entry   Entry to delete (entry name)
  @return   void

  If the given entry can be found, it is deleted from the dictionary.
 */
/*--------------------------------------------------------------------------*/
void iniparser_unset(dictionary * ini, char * entry)
{
    dictionary_unset(ini, strlwc(entry));
}


/*-------------------------------------------------------------------------*/
/**
  @brief    Parse an ini file and return an allocated dictionary object
  @param    ininame Name of the ini file to read.
  @return   Pointer to newly allocated dictionary

  This is the parser for ini files. This function is called, providing
  the name of the file to be read. It returns a dictionary object that
  should not be accessed directly, but through accessor functions
  instead.

  The returned dictionary must be freed using iniparser_freedict().
 */
/*--------------------------------------------------------------------------*/

dictionary * iniparser_load(const char * ininame)
{
    dictionary  *   d ;
    char        lin[ASCIILINESZ+1];
    char        sec[ASCIILINESZ+1];
    char        key[ASCIILINESZ+1];
    char        val[ASCIILINESZ+1];
    char    *   where ;
    FILE    *   ini ;
    int         lineno ;

    if ((ini=fopen(ininame, "r"))==NULL) {
        return NULL ;
    }

    sec[0]=0;

    /*
     * Initialize a new dictionary entry
     */
    if (!(d = dictionary_new(0))) {
	    fclose(ini);
	    return NULL;
    }
    lineno = 0 ;
    while (fgets(lin, ASCIILINESZ, ini)!=NULL) {
        lineno++ ;
        where = strskp(lin); /* Skip leading spaces */
        if (*where==';' || *where=='#' || *where==0)
            continue ; /* Comment lines */
        else {
            if (sscanf(where, "[%[^]]", sec)==1) {
                /* Valid section name */
                strcpy(sec, strlwc(sec));
                iniparser_add_entry(d, sec, NULL, NULL);
            } else if (sscanf (where, "%[^=] = \"%[^\"]\"", key, val) == 2
                   ||  sscanf (where, "%[^=] = '%[^\']'",   key, val) == 2
                   ||  sscanf (where, "%[^=] = %[^;#]",     key, val) == 2) {
                strcpy(key, strlwc(strcrop(key)));
                /*
                 * sscanf cannot handle "" or '' as empty value,
                 * this is done here
                 */
                if (!strcmp(val, "\"\"") || !strcmp(val, "''")) {
                    val[0] = (char)0;
                } else {
                    strcpy(val, strcrop(val));
                }
                iniparser_add_entry(d, sec, key, val);
            }
        }
    }
    fclose(ini);
    return d ;
}



/*-------------------------------------------------------------------------*/
/**
  @brief    Free all memory associated to an ini dictionary
  @param    d Dictionary to free
  @return   void

  Free all memory associated to an ini dictionary.
  It is mandatory to call this function before the dictionary object
  gets out of the current context.
 */
/*--------------------------------------------------------------------------*/

void iniparser_freedict(dictionary * d)
{
    dictionary_del(d);
}

/* vim: set ts=4 et sw=4 tw=75 */