386 lines
12 KiB
C
386 lines
12 KiB
C
/**
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* @file
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* The following is a full featured parser for configuration files using
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* basic format "key = value".
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*
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* Well, it's big, but it can properly manage spaces, empty lines,
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* single and double-quoted strings, hex numbers, comments, semicolons
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* and more. It also happens to be much more robust than the original one.
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*
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* @author zamaz
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*/
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#include <stddef.h>
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#include <assert.h>
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#include "ckvp.h"
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enum {
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STATE_ERROR = 1,
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STATE_BEGIN, /**< initial state */
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STATE_COMMENT, /**< currently in a comment */
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STATE_KEY, /**< (key) currently in a key */
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STATE_KEYBS, /**< (key) backslash */
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STATE_KEYBSX1, /**< (key) first character of a hex value (\\x) */
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STATE_KEYBSX2, /**< (key) second character of a hex value (\\x) */
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STATE_KEYSQ, /**< (key) currently in a simple quoted key */
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STATE_KEYDQ, /**< (key) currently in a double quoted key */
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STATE_KEYDQBS, /**< (key) backslash while in double quotes */
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STATE_KEYDQBSX1, /**< (key) first value of \\x in double quotes */
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STATE_KEYDQBSX2, /**< (key) second value of \\x in double quotes */
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STATE_BEQ, /**< before '=' between key and value */
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STATE_AEQ, /**< after '=' between key and value */
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STATE_VALUE, /**< (value) same as (key) things above, for values */
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STATE_VALBS, /**< (value) backslash */
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STATE_VALBSX1, /**< (value) first character of an hex value (\\x) */
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STATE_VALBSX2, /**< (value) second character of a hex value (\\x) */
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STATE_VALSQ, /**< (value) currently in a simple quoted value */
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STATE_VALDQ, /**< (value) currently in a double quoted value */
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STATE_VALDQBS, /**< (value) backslash while in double quotes */
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STATE_VALDQBSX1, /**< (value) first value of \\x in double quotes */
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STATE_VALDQBSX2, /**< (value) second values of \\x in double quotes */
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STATE_VALEND, /**< end of a value, ready to take a new key */
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ACTION_KEY = 0x0100, /**< key complete */
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ACTION_VALUE = 0x0200, /**< value complete */
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ACTION_ERROR = 0x0400, /**< caught an error */
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ACTION_STORE = 0x1000, /**< character must be stored as is */
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ACTION_STORE_MOD = 0x2000, /**< store filtered character */
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ACTION_STORE_HEX1 = 0x4000, /**< store first hex digit */
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ACTION_STORE_HEX2 = 0x8000 /**< store second hex digit */
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};
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#define HEX_INDICES(st) \
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['0'] = (st), ['1'] = (st), ['2'] = (st), ['3'] = (st), \
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['4'] = (st), ['5'] = (st), ['6'] = (st), ['7'] = (st), \
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['8'] = (st), ['9'] = (st), ['a'] = (st), ['b'] = (st), \
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['c'] = (st), ['d'] = (st), ['e'] = (st), ['f'] = (st), \
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['A'] = (st), ['B'] = (st), ['C'] = (st), ['D'] = (st), \
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['E'] = (st), ['F'] = (st)
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/**
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* ckvp_parse() takes the current state (ckvp), a buffer in[size] and returns
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* the number of characters processed.
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*
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* Each time ckvp_parse() returns, ckvp->state must be checked. If no error
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* occured, ckvp_parse() must be called again with the remaining characters
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* if any, otherwise the next input buffer.
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*
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* At the end of input, ckvp_parse() must be called with a zero size.
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*
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* This function doesn't allocate anything.
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*
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* @param[in,out] ckvp Current state.
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* @param size Number of characters in buffer "in".
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* @param in Input buffer to parse.
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* @return Number of characters processed.
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*/
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size_t ckvp_parse(ckvp_t *ckvp, size_t size, const char in[])
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{
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/**
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* State machine definition:
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*
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* st[current_state][current_character] = next state | action
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*
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* Special indices for current_character are:
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*
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* - 0x100 for action on characters not in the list
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* - 0x101 for action when encountering end of input while in the
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* current state (often ACTION_ERROR)
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*/
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static const unsigned int st[][0x102] = {
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[STATE_ERROR] = {
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[0x100] = (STATE_ERROR | ACTION_ERROR),
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[0x101] = ACTION_ERROR
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},
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[STATE_BEGIN] = {
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[' '] = STATE_BEGIN,
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['\f'] = STATE_BEGIN,
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['\n'] = STATE_BEGIN,
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['\r'] = STATE_BEGIN,
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['\t'] = STATE_BEGIN,
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['\v'] = STATE_BEGIN,
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[';'] = (STATE_ERROR | ACTION_ERROR),
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['#'] = STATE_COMMENT,
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['\''] = STATE_KEYSQ,
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['"'] = STATE_KEYDQ,
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['\\'] = STATE_KEYBS,
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['='] = (STATE_ERROR | ACTION_ERROR),
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[0x100] = (STATE_KEY | ACTION_STORE),
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[0x101] = 0
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},
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[STATE_COMMENT] = {
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['\n'] = STATE_BEGIN,
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[0x100] = STATE_COMMENT,
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[0x101] = 0
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},
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[STATE_KEY] = {
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[' '] = (STATE_BEQ | ACTION_KEY),
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['\f'] = (STATE_BEQ | ACTION_KEY),
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['\n'] = (STATE_BEQ | ACTION_KEY),
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['\r'] = (STATE_BEQ | ACTION_KEY),
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['\t'] = (STATE_BEQ | ACTION_KEY),
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['\v'] = (STATE_BEQ | ACTION_KEY),
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['\''] = STATE_KEYSQ,
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['\"'] = STATE_KEYDQ,
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[';'] = (STATE_ERROR | ACTION_ERROR),
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['='] = (STATE_AEQ | ACTION_KEY),
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['#'] = (STATE_ERROR | ACTION_ERROR),
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['\\'] = STATE_KEYBS,
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[0x100] = (STATE_KEY | ACTION_STORE),
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[0x101] = ACTION_ERROR
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},
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[STATE_KEYBS] = {
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['f'] = (STATE_KEY | ACTION_STORE_MOD),
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['n'] = (STATE_KEY | ACTION_STORE_MOD),
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['r'] = (STATE_KEY | ACTION_STORE_MOD),
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['t'] = (STATE_KEY | ACTION_STORE_MOD),
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['v'] = (STATE_KEY | ACTION_STORE_MOD),
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['x'] = STATE_KEYBSX1,
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['\n'] = STATE_KEY,
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[0x100] = (STATE_KEY | ACTION_STORE),
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[0x101] = ACTION_ERROR
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},
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[STATE_KEYBSX1] = {
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HEX_INDICES(STATE_KEYBSX2 | ACTION_STORE_HEX1),
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[0x100] = (STATE_ERROR | ACTION_ERROR),
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[0x101] = ACTION_ERROR
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},
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[STATE_KEYBSX2] = {
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HEX_INDICES(STATE_KEY | ACTION_STORE_HEX2),
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[0x100] = (STATE_ERROR | ACTION_ERROR),
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[0x101] = ACTION_ERROR
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},
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[STATE_KEYSQ] = {
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['\''] = STATE_KEY,
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[0x100] = (STATE_KEYSQ | ACTION_STORE),
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[0x101] = ACTION_ERROR
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},
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[STATE_KEYDQ] = {
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['"'] = STATE_KEY,
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['\\'] = STATE_KEYDQBS,
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[0x100] = (STATE_KEYDQ | ACTION_STORE),
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[0x101] = ACTION_ERROR
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},
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[STATE_KEYDQBS] = {
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['f'] = (STATE_KEYDQ | ACTION_STORE_MOD),
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['n'] = (STATE_KEYDQ | ACTION_STORE_MOD),
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['r'] = (STATE_KEYDQ | ACTION_STORE_MOD),
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['t'] = (STATE_KEYDQ | ACTION_STORE_MOD),
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['v'] = (STATE_KEYDQ | ACTION_STORE_MOD),
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['x'] = STATE_KEYDQBSX1,
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['\n'] = STATE_KEYDQ,
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[0x100] = (STATE_KEYDQ | ACTION_STORE),
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[0x101] = ACTION_ERROR
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},
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[STATE_KEYDQBSX1] = {
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HEX_INDICES(STATE_KEYDQBSX2 | ACTION_STORE_HEX1),
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[0x100] = (STATE_ERROR | ACTION_ERROR),
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[0x101] = ACTION_ERROR
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},
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[STATE_KEYDQBSX2] = {
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HEX_INDICES(STATE_KEYDQ | ACTION_STORE_HEX2),
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[0x100] = (STATE_ERROR | ACTION_ERROR),
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[0x101] = ACTION_ERROR
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},
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[STATE_BEQ] = {
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[' '] = STATE_BEQ,
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['\f'] = STATE_BEQ,
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['\n'] = STATE_BEQ,
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['\r'] = STATE_BEQ,
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['\t'] = STATE_BEQ,
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['\v'] = STATE_BEQ,
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['='] = STATE_AEQ,
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[0x100] = (STATE_ERROR | ACTION_ERROR),
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[0x101] = ACTION_ERROR
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},
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[STATE_AEQ] = {
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[' '] = STATE_AEQ,
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['\f'] = STATE_AEQ,
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['\n'] = STATE_AEQ,
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['\r'] = STATE_AEQ,
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['\t'] = STATE_AEQ,
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['\v'] = STATE_AEQ,
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['\''] = STATE_VALSQ,
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['\"'] = STATE_VALDQ,
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['\\'] = STATE_VALBS,
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['='] = (STATE_ERROR | ACTION_ERROR),
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['#'] = (STATE_COMMENT | ACTION_VALUE),
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[';'] = (STATE_BEGIN | ACTION_VALUE),
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[0x100] = (STATE_VALUE | ACTION_STORE),
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[0x101] = ACTION_VALUE
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},
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[STATE_VALUE] = {
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[' '] = (STATE_VALEND | ACTION_VALUE),
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['\f'] = (STATE_VALEND | ACTION_VALUE),
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['\n'] = (STATE_BEGIN | ACTION_VALUE),
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['\r'] = (STATE_VALEND | ACTION_VALUE),
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['\t'] = (STATE_VALEND | ACTION_VALUE),
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['\v'] = (STATE_VALEND | ACTION_VALUE),
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['\''] = STATE_VALSQ,
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['\"'] = STATE_VALDQ,
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[';'] = (STATE_BEGIN | ACTION_VALUE),
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['='] = (STATE_ERROR | ACTION_ERROR),
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['#'] = (STATE_COMMENT | ACTION_VALUE),
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['\\'] = STATE_VALBS,
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[0x100] = (STATE_VALUE | ACTION_STORE),
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[0x101] = ACTION_VALUE
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},
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[STATE_VALBS] = {
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['f'] = (STATE_VALUE | ACTION_STORE_MOD),
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['n'] = (STATE_VALUE | ACTION_STORE_MOD),
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['r'] = (STATE_VALUE | ACTION_STORE_MOD),
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['t'] = (STATE_VALUE | ACTION_STORE_MOD),
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['v'] = (STATE_VALUE | ACTION_STORE_MOD),
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['x'] = STATE_VALBSX1,
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['\n'] = STATE_VALUE,
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[0x100] = (STATE_VALUE | ACTION_STORE),
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[0x101] = ACTION_ERROR
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},
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[STATE_VALBSX1] = {
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HEX_INDICES(STATE_VALBSX2 | ACTION_STORE_HEX1),
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[0x100] = (STATE_ERROR | ACTION_ERROR),
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[0x101] = ACTION_ERROR
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},
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[STATE_VALBSX2] = {
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HEX_INDICES(STATE_VALUE | ACTION_STORE_HEX2),
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[0x100] = (STATE_ERROR | ACTION_ERROR),
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[0x101] = ACTION_ERROR
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},
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[STATE_VALSQ] = {
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['\''] = STATE_VALUE,
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[0x100] = (STATE_VALSQ | ACTION_STORE),
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[0x101] = ACTION_ERROR
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},
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[STATE_VALDQ] = {
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['"'] = STATE_VALUE,
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['\\'] = STATE_VALDQBS,
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[0x100] = (STATE_VALDQ | ACTION_STORE),
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[0x101] = ACTION_ERROR
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},
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[STATE_VALDQBS] = {
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['f'] = (STATE_VALDQ | ACTION_STORE_MOD),
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['n'] = (STATE_VALDQ | ACTION_STORE_MOD),
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['r'] = (STATE_VALDQ | ACTION_STORE_MOD),
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['t'] = (STATE_VALDQ | ACTION_STORE_MOD),
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['v'] = (STATE_VALDQ | ACTION_STORE_MOD),
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['x'] = STATE_VALDQBSX1,
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['\n'] = STATE_VALDQ,
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[0x100] = (STATE_VALDQ | ACTION_STORE),
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[0x101] = ACTION_ERROR
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},
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[STATE_VALDQBSX1] = {
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HEX_INDICES(STATE_VALDQBSX2 | ACTION_STORE_HEX1),
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[0x100] = (STATE_ERROR | ACTION_ERROR),
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[0x101] = ACTION_ERROR
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},
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[STATE_VALDQBSX2] = {
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HEX_INDICES(STATE_VALDQ | ACTION_STORE_HEX2),
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[0x100] = (STATE_ERROR | ACTION_ERROR),
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[0x101] = ACTION_ERROR
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},
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[STATE_VALEND] = {
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[' '] = STATE_VALEND,
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['\f'] = STATE_VALEND,
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['\n'] = STATE_BEGIN,
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['\r'] = STATE_VALEND,
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['\t'] = STATE_VALEND,
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['\v'] = STATE_VALEND,
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[';'] = STATE_BEGIN,
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['#'] = STATE_COMMENT,
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[0x100] = (STATE_ERROR | ACTION_ERROR),
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[0x101] = 0
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}
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};
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static const unsigned char cv[] = {
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['f'] = '\f', ['n'] = '\n', ['r'] = '\r',
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['t'] = '\t', ['v'] = '\v'
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};
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static const unsigned char hb[] = {
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['0'] = 0x0, ['1'] = 0x1, ['2'] = 0x2, ['3'] = 0x3,
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['4'] = 0x4, ['5'] = 0x5, ['6'] = 0x6, ['7'] = 0x7,
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['8'] = 0x8, ['9'] = 0x9, ['a'] = 0xa, ['b'] = 0xb,
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['c'] = 0xc, ['d'] = 0xd, ['e'] = 0xe, ['f'] = 0xf,
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['A'] = 0xa, ['B'] = 0xb, ['C'] = 0xc, ['D'] = 0xd,
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['E'] = 0xe, ['F'] = 0xf
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};
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size_t i;
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assert(sizeof(unsigned int) >= 4);
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assert(ckvp != NULL);
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assert(in != NULL);
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if (ckvp->state != CKVP_NONE) {
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ckvp->out_size = 0;
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ckvp->state = CKVP_NONE;
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}
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if (ckvp->internal & 0x00010000) {
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++(ckvp->line);
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ckvp->column = 1;
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}
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else if (ckvp->internal & 0x00020000)
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++(ckvp->column);
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ckvp->internal &= ~(0x00030000);
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if (size == 0) {
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assert((ckvp->internal & 0x00ff) != 0x00);
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assert((ckvp->internal & 0x00ff) <= STATE_VALEND);
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if (st[(ckvp->internal & 0x00ff)][0x101] & ACTION_ERROR)
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ckvp->state = CKVP_ERROR;
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else if (st[(ckvp->internal & 0x00ff)][0x101] & ACTION_VALUE)
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ckvp->state = CKVP_OUT_VALUE;
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return 0;
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}
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for (i = 0; (i < size); ++i) {
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unsigned char c = in[i];
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unsigned int newst;
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assert((ckvp->internal & 0x00ff) != 0x00);
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assert((ckvp->internal & 0x00ff) <= STATE_VALEND);
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if ((newst = st[(ckvp->internal & 0x00ff)][(c & 0xff)]) == 0)
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newst = st[(ckvp->internal & 0x00ff)][0x100];
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ckvp->internal = ((ckvp->internal & 0xffff0000) | newst);
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assert(newst != 0);
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if (newst & 0x0f00) {
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if (newst & ACTION_ERROR)
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ckvp->state = CKVP_ERROR;
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else if (newst & ACTION_KEY)
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ckvp->state = CKVP_OUT_KEY;
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else if (newst & ACTION_VALUE)
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ckvp->state = CKVP_OUT_VALUE;
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goto endnl;
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}
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if (newst & 0xf000) {
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if (newst & ACTION_STORE_HEX1) {
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ckvp->internal &= ~(0x00f00000);
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ckvp->internal |= (hb[c] << 20);
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continue;
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}
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else if (newst & ACTION_STORE_HEX2)
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c = (((ckvp->internal >> 16) & 0xf0) | hb[c]);
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else if (newst & ACTION_STORE_MOD)
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c = cv[c];
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if (ckvp->out_size == CKVP_OUT_SIZE) {
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ckvp->out[0] = c;
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ckvp->out_size = 1;
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}
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else
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ckvp->out[((ckvp->out_size)++)] = c;
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if (ckvp->out_size == CKVP_OUT_SIZE) {
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ckvp->state = CKVP_OUT_FULL;
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goto endnl;
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}
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}
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if (c == '\n') {
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++(ckvp->line);
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ckvp->column = 1;
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}
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else
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++(ckvp->column);
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continue;
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endnl:
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if (c == '\n')
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ckvp->internal |= 0x00010000;
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else
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ckvp->internal |= 0x00020000;
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return ++i;
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}
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return size;
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}
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