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efbcb4ae03
property values.
225 lines
4.8 KiB
C
225 lines
4.8 KiB
C
/*
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*
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* Simple property list handling code.
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*
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* Copyright (c) 1998
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* Jordan Hubbard. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer,
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* verbatim and that no modifications are made prior to this
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* point in the file.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR HIS PETS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, LIFE OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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*/
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#include <ctype.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <err.h>
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#include <sys/types.h>
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#include <libutil.h>
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#define MAX_NAME 64
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#define MAX_VALUE 512
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static properties
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property_alloc(char *name, char *value)
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{
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properties n;
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n = (properties)malloc(sizeof(struct _property));
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n->next = NULL;
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n->name = name ? strdup(name) : NULL;
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n->value = value ? strdup(value) : NULL;
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return n;
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}
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properties
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properties_read(int fd)
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{
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properties head, ptr;
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char hold_n[MAX_NAME + 1];
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char hold_v[MAX_VALUE + 1];
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char buf[BUFSIZ * 4];
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int bp, n, v, max;
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enum { LOOK, COMMENT, NAME, VALUE, MVALUE, COMMIT, FILL, STOP } state;
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int ch = 0, blevel = 0;
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n = v = bp = max = 0;
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head = ptr = NULL;
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state = LOOK;
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while (state != STOP) {
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if (state != COMMIT) {
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if (bp == max)
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state = FILL;
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else
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ch = buf[bp++];
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}
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switch(state) {
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case FILL:
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if ((max = read(fd, buf, sizeof buf)) <= 0) {
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state = STOP;
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break;
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}
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else {
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state = LOOK;
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ch = buf[0];
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bp = 1;
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}
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/* Fall through deliberately since we already have a character and state == LOOK */
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case LOOK:
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if (isspace(ch))
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continue;
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/* Allow shell or lisp style comments */
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else if (ch == '#' || ch == ';') {
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state = COMMENT;
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continue;
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}
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else if (isalnum(ch) || ch == '_') {
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if (n >= MAX_NAME) {
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n = 0;
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state = COMMENT;
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}
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else {
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hold_n[n++] = ch;
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state = NAME;
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}
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}
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else
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state = COMMENT; /* Ignore the rest of the line */
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break;
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case COMMENT:
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if (ch == '\n')
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state = LOOK;
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break;
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case NAME:
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if (ch == '\n' || !ch) {
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hold_n[n] = '\0';
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hold_v[0] = '\0';
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v = n = 0;
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state = COMMIT;
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}
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else if (isspace(ch))
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continue;
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else if (ch == '=') {
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hold_n[n] = '\0';
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v = n = 0;
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state = VALUE;
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}
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else
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hold_n[n++] = ch;
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break;
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case VALUE:
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if (v == 0 && isspace(ch))
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continue;
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else if (ch == '{') {
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state = MVALUE;
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++blevel;
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}
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else if (ch == '\n' || !ch) {
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hold_v[v] = '\0';
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v = n = 0;
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state = COMMIT;
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}
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else {
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if (v >= MAX_VALUE) {
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state = COMMENT;
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v = n = 0;
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break;
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}
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else
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hold_v[v++] = ch;
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}
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break;
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case MVALUE:
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/* multiline value */
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if (v >= MAX_VALUE) {
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warn("properties_read: value exceeds max length");
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state = COMMENT;
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n = v = 0;
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}
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else if (ch == '}' && !--blevel) {
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hold_v[v] = '\0';
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v = n = 0;
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state = COMMIT;
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}
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else {
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hold_v[v++] = ch;
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if (ch == '{')
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++blevel;
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}
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break;
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case COMMIT:
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if (!head)
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head = ptr = property_alloc(hold_n, hold_v);
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else {
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ptr->next = property_alloc(hold_n, hold_v);
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ptr = ptr->next;
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}
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state = LOOK;
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v = n = 0;
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break;
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case STOP:
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/* we don't handle this here, but this prevents warnings */
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break;
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}
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}
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return head;
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}
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char *
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property_find(properties list, const char *name)
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{
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if (!list || !name || !name[0])
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return NULL;
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while (list) {
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if (!strcmp(list->name, name))
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return list->value;
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list = list->next;
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}
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return NULL;
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}
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void
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properties_free(properties list)
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{
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properties tmp;
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while (list) {
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tmp = list->next;
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if (list->name)
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free(list->name);
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if (list->value)
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free(list->value);
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free(list);
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list = tmp;
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}
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}
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