121 lines
3.0 KiB
C
121 lines
3.0 KiB
C
/* This file provides functionality to parse strings of comma-separated
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* options, each being either a single key name or a key=value pair, where the
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* value may be enclosed in quotes. A table of optset entries is provided to
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* determine which options are recognized, how to parse their values, and where
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* to store those. Unrecognized options are silently ignored; improperly
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* formatted options are silently set to reasonably acceptable values.
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*
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* The entry points into this file are:
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* optset_parse parse the given options string using the given table
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*
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* Created:
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* May 2009 (D.C. van Moolenbroek)
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*/
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#include <stdlib.h>
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#include <string.h>
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#include <minix/config.h>
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#include <minix/const.h>
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#include <minix/optset.h>
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static void optset_parse_entry(struct optset *entry, char *ptr, int len);
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/*===========================================================================*
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* optset_parse_entry *
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*===========================================================================*/
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static void optset_parse_entry(struct optset *entry, char *ptr, int len)
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{
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/* Parse and store the value of a single option.
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*/
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char *dst;
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int val;
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switch (entry->os_type) {
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case OPT_BOOL:
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*((int *) entry->os_ptr) = entry->os_val;
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break;
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case OPT_STRING:
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if (len >= entry->os_val)
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len = entry->os_val - 1;
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dst = (char *) entry->os_ptr;
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if (len > 0)
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memcpy(dst, ptr, len);
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dst[len] = 0;
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break;
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case OPT_INT:
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if (len > 0)
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val = (int) strtoul(ptr, NULL, entry->os_val);
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else
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val = 0;
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*((int *) entry->os_ptr) = val;
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break;
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}
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}
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/*===========================================================================*
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* optset_parse *
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*===========================================================================*/
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void optset_parse(struct optset *table, char *string)
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{
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/* Parse a string of options, using the provided table of optset entries.
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*/
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char *p, *kptr, *vptr;
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int i, klen, vlen;
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for (p = string; *p; ) {
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/* Get the key name for the field. */
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for (kptr = p, klen = 0; *p && *p != '=' && *p != ','; p++, klen++);
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if (*p == '=') {
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/* The field has an associated value. */
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vptr = ++p;
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/* If the first character after the '=' is a quote character,
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* find a matching quote character followed by either a comma
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* or the terminating null character, and use the string in
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* between. Otherwise, use the string up to the next comma or
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* the terminating null character.
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*/
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if (*p == '\'' || *p == '"') {
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p++;
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for (vlen = 0; *p && (*p != *vptr ||
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(p[1] && p[1] != ',')); p++, vlen++);
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if (*p) p++;
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vptr++;
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}
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else
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for (vlen = 0; *p && *p != ','; p++, vlen++);
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}
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else {
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vptr = NULL;
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vlen = 0;
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}
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if (*p == ',') p++;
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/* Find a matching entry for this key in the given table. If found,
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* call optset_parse_entry() on it. Silently ignore the option
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* otherwise.
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*/
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for (i = 0; table[i].os_name != NULL; i++) {
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if ((int) strlen(table[i].os_name) == klen &&
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!strncasecmp(table[i].os_name, kptr, klen)) {
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optset_parse_entry(&table[i], vptr, vlen);
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break;
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}
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}
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}
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}
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