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Diffstat (limited to 'lib/libutil/property.c')
| -rw-r--r-- | lib/libutil/property.c | 224 |
1 files changed, 224 insertions, 0 deletions
diff --git a/lib/libutil/property.c b/lib/libutil/property.c new file mode 100644 index 0000000..23714a0 --- /dev/null +++ b/lib/libutil/property.c @@ -0,0 +1,224 @@ +/* + * + * Simple property list handling code. + * + * Copyright (c) 1998 + * Jordan Hubbard. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer, + * verbatim and that no modifications are made prior to this + * point in the file. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR + * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR HIS PETS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, LIFE OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + */ + +#include <ctype.h> +#include <unistd.h> +#include <stdlib.h> +#include <stdio.h> +#include <string.h> +#include <err.h> +#include <sys/types.h> +#include <libutil.h> + +#define MAX_NAME 64 +#define MAX_VALUE 512 + +static properties +property_alloc(char *name, char *value) +{ + properties n; + + n = (properties)malloc(sizeof(struct _property)); + n->next = NULL; + n->name = name ? strdup(name) : NULL; + n->value = value ? strdup(value) : NULL; + return n; +} + +properties +properties_read(int fd) +{ + properties head, ptr; + char hold_n[MAX_NAME + 1]; + char hold_v[MAX_VALUE + 1]; + char buf[BUFSIZ * 4]; + int bp, n, v, max; + enum { LOOK, COMMENT, NAME, VALUE, MVALUE, COMMIT, FILL, STOP } state; + int ch = 0, blevel = 0; + + n = v = bp = max = 0; + head = ptr = NULL; + state = LOOK; + while (state != STOP) { + if (state != COMMIT) { + if (bp == max) + state = FILL; + else + ch = buf[bp++]; + } + switch(state) { + case FILL: + if ((max = read(fd, buf, sizeof buf)) <= 0) { + state = STOP; + break; + } + else { + state = LOOK; + ch = buf[0]; + bp = 1; + } + /* Fall through deliberately since we already have a character and state == LOOK */ + + case LOOK: + if (isspace(ch)) + continue; + /* Allow shell or lisp style comments */ + else if (ch == '#' || ch == ';') { + state = COMMENT; + continue; + } + else if (isalnum(ch) || ch == '_') { + if (n >= MAX_NAME) { + n = 0; + state = COMMENT; + } + else { + hold_n[n++] = ch; + state = NAME; + } + } + else + state = COMMENT; /* Ignore the rest of the line */ + break; + + case COMMENT: + if (ch == '\n') + state = LOOK; + break; + + case NAME: + if (ch == '\n' || !ch) { + hold_n[n] = '\0'; + hold_v[0] = '\0'; + v = n = 0; + state = COMMIT; + } + else if (isspace(ch)) + continue; + else if (ch == '=') { + hold_n[n] = '\0'; + v = n = 0; + state = VALUE; + } + else + hold_n[n++] = ch; + break; + + case VALUE: + if (v == 0 && isspace(ch)) + continue; + else if (ch == '{') { + state = MVALUE; + ++blevel; + } + else if (ch == '\n' || !ch) { + hold_v[v] = '\0'; + v = n = 0; + state = COMMIT; + } + else { + if (v >= MAX_VALUE) { + state = COMMENT; + v = n = 0; + break; + } + else + hold_v[v++] = ch; + } + break; + + case MVALUE: + /* multiline value */ + if (v >= MAX_VALUE) { + warn("properties_read: value exceeds max length"); + state = COMMENT; + n = v = 0; + } + else if (ch == '}' && !--blevel) { + hold_v[v] = '\0'; + v = n = 0; + state = COMMIT; + } + else { + hold_v[v++] = ch; + if (ch == '{') + ++blevel; + } + break; + + case COMMIT: + if (!head) + head = ptr = property_alloc(hold_n, hold_v); + else { + ptr->next = property_alloc(hold_n, hold_v); + ptr = ptr->next; + } + state = LOOK; + v = n = 0; + break; + + case STOP: + /* we don't handle this here, but this prevents warnings */ + break; + } + } + return head; +} + +char * +property_find(properties list, const char *name) +{ + if (!list || !name || !name[0]) + return NULL; + while (list) { + if (!strcmp(list->name, name)) + return list->value; + list = list->next; + } + return NULL; +} + +void +properties_free(properties list) +{ + properties tmp; + + while (list) { + tmp = list->next; + if (list->name) + free(list->name); + if (list->value) + free(list->value); + free(list); + list = tmp; + } +} |
