export a function for parsing shell-style arguments in libuci

[project/uci.git] / util.c

diff --git a/util.c b/util.c
index 78b22cf..0ac33c7 100644 (file)
--- a/util.c
+++ b/util.c
@@ -146,7 +146,10 @@ static void uci_parse_error(struct uci_context *ctx, char *pos, char *reason)
        struct uci_parse_context *pctx = ctx->pctx;
 
        pctx->reason = reason;
-       pctx->byte = pos - pctx->buf;
+       if ((pos < pctx->buf) || (pos > pctx->buf + pctx->bufsz))
+               pctx->byte = 0;
+       else
+               pctx->byte = pos - pctx->buf;
        UCI_THROW(ctx, UCI_ERR_PARSE);
 }
 
@@ -189,6 +192,176 @@ static void uci_getln(struct uci_context *ctx, int offset)
        } 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, char **str, char **result)
+{
+       UCI_HANDLE_ERR(ctx);
+       UCI_ASSERT(ctx, (str != NULL) && (*str != NULL));
+       UCI_ASSERT(ctx, result != NULL);
+
+       *result = next_arg(ctx, str, false, false);
+       return 0;
+}
+
+
 /*
  * open a stream and go to the right position
  *