[pacman-dev] alpm_list regex matching

[leslie.polzer at gmx.net]

Hello,

  inlined diff (p0, hope that's not a problem) adds regex matching to
alpm_list; useful for regular expressions in IgnorePkg etc.

I'll leave the actual usage up to you and hope it helps somehow :)

  Leslie

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Index: lib/libalpm/alpm_list.c
===================================================================
RCS file: /home/cvs-pacman/pacman-lib/lib/libalpm/alpm_list.c,v
retrieving revision 1.11
diff -a -p -u -r1.11 alpm_list.c
--- lib/libalpm/alpm_list.c	11 Mar 2007 21:10:03 -0000	1.11
+++ lib/libalpm/alpm_list.c	14 Apr 2007 19:18:15 -0000
@@ -24,9 +24,11 @@
 #include <stdlib.h>
 #include <string.h>
 #include <stdio.h>
+#include <regex.h>
 
 /* libalpm */
 #include "alpm_list.h"
+#include "error.h"
 #include "util.h"
 
 /** \defgroup alpm_list functions */
@@ -458,6 +460,39 @@ int SYMEXPORT alpm_list_find_str(alpm_li
 	return(0);
 }
 
+/* Test for existence of a string in an alpm_list_t, treating the list
+ * elements as regular expressions
+*/
+/** Is a _string_ in the list (optimization of alpm_list_find for strings)
+ *  @param needle the string to compare
+ *  @param haystack the list to search
+ *  @return 1 if `needle` is found, 0 otherwise
+ */
+
+int SYMEXPORT alpm_list_find_str_regex(alpm_list_t *haystack, const char *needle)
+{
+	alpm_list_t *lp = haystack;
+
+	while(lp) {
+		if(lp->data) {
+			char* targ = lp->data;
+			regex_t reg;
+
+			_alpm_log(PM_LOG_DEBUG, "matching needle '%s' against haystack item '%s'",
+					needle, lp->data);
+
+			if(regcomp(&reg, targ, REG_EXTENDED | REG_NOSUB | REG_ICASE | REG_NEWLINE) != 0) {
+				RET_ERR(PM_ERR_INVALID_REGEX, NULL);
+			}
+
+			if (regexec(&reg, needle, 0, 0, 0) == 0) {
+				return(1);
+			}
+		}
+		lp = lp->next;
+	}
+	return(0);
+}
 /** 
  * Calculate the items in list `lhs` that are not present in list `rhs`
  * @note Entries are not duplicated