*/
/*
- * This file contains wrappers to standard functions, which
- * throw exceptions upon failure.
+ * This file contains misc utility functions and wrappers to standard
+ * functions, which throw exceptions upon failure.
*/
#include <sys/types.h>
#include <sys/stat.h>
return ptr;
}
+/* Based on an efficient hash function published by D. J. Bernstein */
+static unsigned int djbhash(unsigned int hash, char *str)
+{
+ int len = strlen(str);
+ int i;
+
+ /* initial value */
+ if (hash == ~0)
+ hash = 5381;
+
+ for(i = 0; i < len; i++) {
+ hash = ((hash << 5) + hash) + str[i];
+ }
+ return (hash & 0x7FFFFFFF);
+}
+
/*
* validate strings for names and types, reject special characters
* for names, only alphanum and _ is allowed (shell compatibility)
UCI_HANDLE_ERR(ctx);
UCI_ASSERT(ctx, str && package && section && option);
- *package = strtok(str, ".");
+ last = strchr(str, '=');
+ if (last) {
+ *last = 0;
+ last++;
+ }
+
+ *package = strsep(&str, ".");
if (!*package || !uci_validate_name(*package))
goto error;
- last = *package;
- *section = strtok(NULL, ".");
+ *section = strsep(&str, ".");
if (!*section)
goto lastval;
- last = *section;
- *option = strtok(NULL, ".");
+ *option = strsep(&str, ".");
if (!*option)
goto lastval;
- last = *option;
-
lastval:
- last = strchr(last, '=');
if (last) {
if (!value)
goto error;
- *last = 0;
- last++;
if (!*last)
goto error;
*value = last;
}
- if (*section && !uci_validate_name(*section))
+ if (*section && *section[0] && !uci_validate_name(*section))
goto error;
if (*option && !uci_validate_name(*option))
goto error;
} while (1);
}
+/*
+ * parse a character escaped by '\'
+ * returns true if the escaped character is to be parsed
+ * returns false if the escaped character is to be ignored
+ */
+static inline bool parse_backslash(struct uci_context *ctx, char **str)
+{
+ /* skip backslash */
+ *str += 1;
+
+ /* undecoded backslash at the end of line, fetch the next line */
+ if (!**str) {
+ *str += 1;
+ uci_getln(ctx, *str - ctx->pctx->buf);
+ return false;
+ }
+
+ /* FIXME: decode escaped char, necessary? */
+ return true;
+}
+
+/*
+ * move the string pointer forward until a non-whitespace character or
+ * EOL is reached
+ */
+static void skip_whitespace(struct uci_context *ctx, char **str)
+{
+restart:
+ while (**str && isspace(**str))
+ *str += 1;
+
+ if (**str == '\\') {
+ if (!parse_backslash(ctx, str))
+ goto restart;
+ }
+}
+
+static inline void addc(char **dest, char **src)
+{
+ **dest = **src;
+ *dest += 1;
+ *src += 1;
+}
+
+/*
+ * parse a double quoted string argument from the command line
+ */
+static void parse_double_quote(struct uci_context *ctx, char **str, char **target)
+{
+ char c;
+
+ /* skip quote character */
+ *str += 1;
+
+ while ((c = **str)) {
+ switch(c) {
+ case '"':
+ **target = 0;
+ *str += 1;
+ return;
+ case '\\':
+ if (!parse_backslash(ctx, str))
+ continue;
+ /* fall through */
+ default:
+ addc(target, str);
+ break;
+ }
+ }
+ uci_parse_error(ctx, *str, "unterminated \"");
+}
+
+/*
+ * parse a single quoted string argument from the command line
+ */
+static void parse_single_quote(struct uci_context *ctx, char **str, char **target)
+{
+ char c;
+ /* skip quote character */
+ *str += 1;
+
+ while ((c = **str)) {
+ switch(c) {
+ case '\'':
+ **target = 0;
+ *str += 1;
+ return;
+ default:
+ addc(target, str);
+ }
+ }
+ uci_parse_error(ctx, *str, "unterminated '");
+}
+
+/*
+ * parse a string from the command line and detect the quoting style
+ */
+static void parse_str(struct uci_context *ctx, char **str, char **target)
+{
+ do {
+ switch(**str) {
+ case '\'':
+ parse_single_quote(ctx, str, target);
+ break;
+ case '"':
+ parse_double_quote(ctx, str, target);
+ break;
+ case '#':
+ **str = 0;
+ /* fall through */
+ case 0:
+ goto done;
+ case '\\':
+ if (!parse_backslash(ctx, str))
+ continue;
+ /* fall through */
+ default:
+ addc(target, str);
+ break;
+ }
+ } while (**str && !isspace(**str));
+done:
+
+ /*
+ * if the string was unquoted and we've stopped at a whitespace
+ * character, skip to the next one, because the whitespace will
+ * be overwritten by a null byte here
+ */
+ if (**str)
+ *str += 1;
+
+ /* terminate the parsed string */
+ **target = 0;
+}
+
+/*
+ * extract the next argument from the command line
+ */
+static char *next_arg(struct uci_context *ctx, char **str, bool required, bool name)
+{
+ char *val;
+ char *ptr;
+
+ val = ptr = *str;
+ skip_whitespace(ctx, str);
+ parse_str(ctx, str, &ptr);
+ if (!*val) {
+ if (required)
+ uci_parse_error(ctx, *str, "insufficient arguments");
+ goto done;
+ }
+
+ if (name && !uci_validate_name(val))
+ uci_parse_error(ctx, val, "invalid character in field");
+
+done:
+ return val;
+}
+
+int uci_parse_argument(struct uci_context *ctx, FILE *stream, char **str, char **result)
+{
+ UCI_HANDLE_ERR(ctx);
+ UCI_ASSERT(ctx, str != NULL);
+ UCI_ASSERT(ctx, result != NULL);
+
+ if (ctx->pctx) {
+ if (ctx->pctx->file != stream) {
+ uci_cleanup(ctx);
+ }
+ } else {
+ uci_alloc_parse_context(ctx);
+ ctx->pctx->file = stream;
+ }
+ if (!*str) {
+ uci_getln(ctx, 0);
+ *str = ctx->pctx->buf;
+ }
+
+ *result = next_arg(ctx, str, false, false);
+
+ return 0;
+}
+
+
/*
* open a stream and go to the right position
*
}
fd = open(filename, mode, UCI_FILEMODE);
- if (fd <= 0)
+ if (fd < 0)
goto error;
if (flock(fd, (write ? LOCK_EX : LOCK_SH)) < 0)
projects / project / uci.git / blobdiff