http://ndevilla.free.fr/iniparser/ Welcome to iniParser -- version 3.1 released 08 Apr 2012 This modules offers parsing of ini files from the C level. See a complete documentation in HTML format, from this directory open the file html/index.html with any HTML-capable browser. Enjoy! N.Devillard Sun Apr 8 16:38:09 CEST 2012
Diff: iniparser.c
- Revision:
- 0:1a9f9f36242e
diff -r 000000000000 -r 1a9f9f36242e iniparser.c --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/iniparser.c Mon Sep 17 00:33:09 2012 +0000 @@ -0,0 +1,748 @@ + +/*-------------------------------------------------------------------------*/ +/** + @file iniparser.c + @author N. Devillard + @brief Parser for ini files. +*/ +/*--------------------------------------------------------------------------*/ +/*---------------------------- Includes ------------------------------------*/ +#include <ctype.h> +#include "iniparser.h" + +/*---------------------------- Defines -------------------------------------*/ +#define ASCIILINESZ (1024) +#define INI_INVALID_KEY ((char*)-1) + +/*--------------------------------------------------------------------------- + Private to this module + ---------------------------------------------------------------------------*/ +/** + * This enum stores the status for each parsed line (internal use only). + */ +typedef enum _line_status_ { + LINE_UNPROCESSED, + LINE_ERROR, + LINE_EMPTY, + LINE_COMMENT, + LINE_SECTION, + LINE_VALUE +} line_status ; + +/*-------------------------------------------------------------------------*/ +/** + @brief Convert a string to lowercase. + @param s String to convert. + @return ptr to statically allocated string. + + This function returns a pointer to a statically allocated string + containing a lowercased version of the input string. Do not free + or modify the returned string! Since the returned string is statically + allocated, it will be modified at each function call (not re-entrant). + */ +/*--------------------------------------------------------------------------*/ +static char * strlwc(const char * s) +{ + static char l[ASCIILINESZ+1]; + int i ; + + if (s==NULL) return NULL ; + memset(l, 0, ASCIILINESZ+1); + i=0 ; + while (s[i] && i<ASCIILINESZ) { + l[i] = (char)tolower((int)s[i]); + i++ ; + } + l[ASCIILINESZ]=(char)0; + return l ; +} + +/*-------------------------------------------------------------------------*/ +/** + @brief Remove blanks at the beginning and the end of a string. + @param s String to parse. + @return ptr to statically allocated string. + + This function returns a pointer to a statically allocated string, + which is identical to the input string, except that all blank + characters at the end and the beg. of the string have been removed. + Do not free or modify the returned string! Since the returned string + is statically allocated, it will be modified at each function call + (not re-entrant). + */ +/*--------------------------------------------------------------------------*/ +static char * strstrip(const char * s) +{ + static char l[ASCIILINESZ+1]; + char * last ; + + if (s==NULL) return NULL ; + + while (isspace((int)*s) && *s) s++; + memset(l, 0, ASCIILINESZ+1); + strcpy(l, s); + last = l + strlen(l); + while (last > l) { + if (!isspace((int)*(last-1))) + break ; + last -- ; + } + *last = (char)0; + return (char*)l ; +} + +/*-------------------------------------------------------------------------*/ +/** + @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 ; + int nsec ; + char * secname ; + + 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) ; + iniparser_dumpsection_ini(d, secname, f) ; + } + fprintf(f, "\n"); + return ; +} + +/*-------------------------------------------------------------------------*/ +/** + @brief Save a dictionary section to a loadable ini file + @param d Dictionary to dump + @param s Section name of dictionary to dump + @param f Opened file pointer to dump to + @return void + + This function dumps a given section of a given dictionary into a loadable ini + file. It is Ok to specify @c stderr or @c stdout as output files. + */ +/*--------------------------------------------------------------------------*/ +void iniparser_dumpsection_ini(dictionary * d, char * s, FILE * f) +{ + int j ; + char keym[ASCIILINESZ+1]; + int seclen ; + + if (d==NULL || f==NULL) return ; + if (! iniparser_find_entry(d, s)) return ; + + seclen = (int)strlen(s); + fprintf(f, "\n[%s]\n", s); + sprintf(keym, "%s:", s); + 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 number of keys in a section of a dictionary. + @param d Dictionary to examine + @param s Section name of dictionary to examine + @return Number of keys in section + */ +/*--------------------------------------------------------------------------*/ +int iniparser_getsecnkeys(dictionary * d, char * s) +{ + int seclen, nkeys ; + char keym[ASCIILINESZ+1]; + int j ; + + nkeys = 0; + + if (d==NULL) return nkeys; + if (! iniparser_find_entry(d, s)) return nkeys; + + seclen = (int)strlen(s); + sprintf(keym, "%s:", s); + + for (j=0 ; j<d->size ; j++) { + if (d->key[j]==NULL) + continue ; + if (!strncmp(d->key[j], keym, seclen+1)) + nkeys++; + } + + return nkeys; + +} + +/*-------------------------------------------------------------------------*/ +/** + @brief Get the number of keys in a section of a dictionary. + @param d Dictionary to examine + @param s Section name of dictionary to examine + @return pointer to statically allocated character strings + + This function queries a dictionary and finds all keys in a given section. + Each pointer in the returned char pointer-to-pointer is pointing to + a string allocated in the dictionary; do not free or modify them. + + This function returns NULL in case of error. + */ +/*--------------------------------------------------------------------------*/ +char ** iniparser_getseckeys(dictionary * d, char * s) +{ + + char **keys; + + int i, j ; + char keym[ASCIILINESZ+1]; + int seclen, nkeys ; + + keys = NULL; + + if (d==NULL) return keys; + if (! iniparser_find_entry(d, s)) return keys; + + nkeys = iniparser_getsecnkeys(d, s); + + keys = (char**) malloc(nkeys*sizeof(char*)); + + seclen = (int)strlen(s); + sprintf(keym, "%s:", s); + + i = 0; + + for (j=0 ; j<d->size ; j++) { + if (d->key[j]==NULL) + continue ; + if (!strncmp(d->key[j], keym, seclen+1)) { + keys[i] = d->key[j]; + i++; + } + } + + return keys; + +} + +/*-------------------------------------------------------------------------*/ +/** + @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 ; + + lc_key = strlwc(key); + sval = dictionary_get(d, lc_key, def); + 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, const 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, + const 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_set(dictionary * ini, const char * entry, const char * val) +{ + return dictionary_set(ini, strlwc(entry), val) ; +} + +/*-------------------------------------------------------------------------*/ +/** + @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, const char * entry) +{ + dictionary_unset(ini, strlwc(entry)); +} + +/*-------------------------------------------------------------------------*/ +/** + @brief Load a single line from an INI file + @param input_line Input line, may be concatenated multi-line input + @param section Output space to store section + @param key Output space to store key + @param value Output space to store value + @return line_status value + */ +/*--------------------------------------------------------------------------*/ +static line_status iniparser_line( + const char * input_line, + char * section, + char * key, + char * value) +{ + line_status sta ; + char line[ASCIILINESZ+1]; + int len ; + + strcpy(line, strstrip(input_line)); + len = (int)strlen(line); + + sta = LINE_UNPROCESSED ; + if (len<1) { + /* Empty line */ + sta = LINE_EMPTY ; + } else if (line[0]=='#' || line[0]==';') { + /* Comment line */ + sta = LINE_COMMENT ; + } else if (line[0]=='[' && line[len-1]==']') { + /* Section name */ + sscanf(line, "[%[^]]", section); + strcpy(section, strstrip(section)); + strcpy(section, strlwc(section)); + sta = LINE_SECTION ; + } else if (sscanf (line, "%[^=] = \"%[^\"]\"", key, value) == 2 + || sscanf (line, "%[^=] = '%[^\']'", key, value) == 2 + || sscanf (line, "%[^=] = %[^;#]", key, value) == 2) { + /* Usual key=value, with or without comments */ + strcpy(key, strstrip(key)); + strcpy(key, strlwc(key)); + strcpy(value, strstrip(value)); + /* + * sscanf cannot handle '' or "" as empty values + * this is done here + */ + if (!strcmp(value, "\"\"") || (!strcmp(value, "''"))) { + value[0]=0 ; + } + sta = LINE_VALUE ; + } else if (sscanf(line, "%[^=] = %[;#]", key, value)==2 + || sscanf(line, "%[^=] %[=]", key, value) == 2) { + /* + * Special cases: + * key= + * key=; + * key=# + */ + strcpy(key, strstrip(key)); + strcpy(key, strlwc(key)); + value[0]=0 ; + sta = LINE_VALUE ; + } else { + /* Generate syntax error */ + sta = LINE_ERROR ; + } + return sta ; +} + +/*-------------------------------------------------------------------------*/ +/** + @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) +{ + FILE * in ; + + char line [ASCIILINESZ+1] ; + char section [ASCIILINESZ+1] ; + char key [ASCIILINESZ+1] ; + char tmp [ASCIILINESZ+1] ; + char val [ASCIILINESZ+1] ; + + int last=0 ; + int len ; + int lineno=0 ; + int errs=0; + + dictionary * dict ; + + if ((in=fopen(ininame, "r"))==NULL) { + fprintf(stderr, "iniparser: cannot open %s\n", ininame); + return NULL ; + } + + dict = dictionary_new(0) ; + if (!dict) { + fclose(in); + return NULL ; + } + + memset(line, 0, ASCIILINESZ); + memset(section, 0, ASCIILINESZ); + memset(key, 0, ASCIILINESZ); + memset(val, 0, ASCIILINESZ); + last=0 ; + + while (fgets(line+last, ASCIILINESZ-last, in)!=NULL) { + lineno++ ; + len = (int)strlen(line)-1; + if (len==0) + continue; + /* Safety check against buffer overflows */ + if (line[len]!='\n') { + fprintf(stderr, + "iniparser: input line too long in %s (%d)\n", + ininame, + lineno); + dictionary_del(dict); + fclose(in); + return NULL ; + } + /* Get rid of \n and spaces at end of line */ + while ((len>=0) && + ((line[len]=='\n') || (isspace(line[len])))) { + line[len]=0 ; + len-- ; + } + /* Detect multi-line */ + if (line[len]=='\\') { + /* Multi-line value */ + last=len ; + continue ; + } else { + last=0 ; + } + switch (iniparser_line(line, section, key, val)) { + case LINE_EMPTY: + case LINE_COMMENT: + break ; + + case LINE_SECTION: + errs = dictionary_set(dict, section, NULL); + break ; + + case LINE_VALUE: + sprintf(tmp, "%s:%s", section, key); + errs = dictionary_set(dict, tmp, val) ; + break ; + + case LINE_ERROR: + fprintf(stderr, "iniparser: syntax error in %s (%d):\n", + ininame, + lineno); + fprintf(stderr, "-> %s\n", line); + errs++ ; + break; + + default: + break ; + } + memset(line, 0, ASCIILINESZ); + last=0; + if (errs<0) { + fprintf(stderr, "iniparser: memory allocation failure\n"); + break ; + } + } + if (errs) { + dictionary_del(dict); + dict = NULL ; + } + fclose(in); + return dict ; +} + +/*-------------------------------------------------------------------------*/ +/** + @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 */