pkg_depends: fix version constraints

* factor parsing version constraint to str_to_constraint and use that
  from pkg (pkg_version_satisfied) and also pkg_depends (parseDepends)
* fix constraint_to_str(), for EARLIER and LATER it was using '<' and
  '>' which is parsed later as EARLIER_EQUAL and LATER_EQUAL
* show notice when deprecated '<' or '>' is used

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>

git-svn-id: http://opkg.googlecode.com/svn/trunk@644 e8e0d7a0-c8d9-11dd-a880-a1081c7ac358

3 files changed, 59 insertions, 51 deletions

diff --git a/libopkg/pkg.c b/libopkg/pkg.c
index 39f4b30..23055f3 100644
--- a/libopkg/pkg.c
+++ b/libopkg/pkg.c
@@ -968,28 +968,24 @@ pkg_version_satisfied(pkg_t *it, pkg_t *ref, const char *op)
      int r;
 
      r = pkg_compare_versions(it, ref);
+     char *op2 = op;
+     enum version_constraint constraint = str_to_constraint(&op2);
 
-     if (strcmp(op, "<=") == 0 || strcmp(op, "<") == 0) {
-	  return r <= 0;
-     }
-
-     if (strcmp(op, ">=") == 0 || strcmp(op, ">") == 0) {
-	  return r >= 0;
-     }
-
-     if (strcmp(op, "<<") == 0) {
-	  return r < 0;
-     }
-
-     if (strcmp(op, ">>") == 0) {
-	  return r > 0;
-     }
-
-     if (strcmp(op, "=") == 0) {
-	  return r == 0;
+     switch (constraint)
+     {
+     case EARLIER_EQUAL:
+          return r <= 0;
+     case LATER_EQUAL:
+          return r >= 0;
+     case EARLIER:
+          return r < 0;
+     case LATER:
+          return r > 0;
+     case EQUAL:
+          return r == 0;
+     case NONE:
+          opkg_msg(ERROR, "Unknown operator: %s.\n", op);
      }
-
-     opkg_msg(ERROR, "Unknown operator: %s.\n", op);
      return 0;
 }
 
diff --git a/libopkg/pkg_depends.c b/libopkg/pkg_depends.c
index d45f697..243fac7 100644
--- a/libopkg/pkg_depends.c
+++ b/libopkg/pkg_depends.c
@@ -781,7 +781,7 @@ constraint_to_str(enum version_constraint c)
 	case NONE:
 		return "";
 	case EARLIER:
-		return "< ";
+		return "<< ";
 	case EARLIER_EQUAL:
 	       return "<= ";
 	case EQUAL:
@@ -789,12 +789,51 @@ constraint_to_str(enum version_constraint c)
 	case LATER_EQUAL:
 	      return ">= ";
 	case LATER:
-	     return "> ";
+	     return ">> ";
 	}
 
 	return "";
 }
 
+enum version_constraint
+str_to_constraint(char **str)
+{
+	if(!strncmp(*str, "<<", 2)){
+		*str += 2;
+		return EARLIER;
+	}
+	else if(!strncmp(*str, "<=", 2)){
+		*str += 2;
+		return EARLIER_EQUAL;
+	}
+	else if(!strncmp(*str, ">=", 2)){
+		*str += 2;
+		return LATER_EQUAL;
+	}
+	else if(!strncmp(*str, ">>", 2)){
+		*str += 2;
+		return LATER;
+	}
+	else if(!strncmp(*str, "=", 1)){
+		*str += 1;
+		return EQUAL;
+	}
+	/* should these be here to support deprecated designations; dpkg does */
+	else if(!strncmp(*str, "<", 1)){
+		*str += 1;
+		opkg_msg(NOTICE, "Deprecated version constraint '<' was used with the same meaning as '<='. Use '<<' for EARLIER constraint.\n");
+		return EARLIER_EQUAL;
+	}
+	else if(!strncmp(*str, ">", 1)){
+		*str += 1;
+		opkg_msg(NOTICE, "Deprecated version constraint '>' was used with the same meaning as '>='. Use '>>' for LATER constraint.\n");
+		return LATER_EQUAL;
+	}
+	else {
+		return NONE;
+	}
+}
+
 /*
  * Returns a printable string for pkg's dependency at the specified idx. The
  * resultant string must be passed to free() by the caller.
@@ -949,35 +988,7 @@ static int parseDepends(compound_depend_t *compound_depend,
 	  /* extract constraint and version */
 	  if(*src == '('){
 	       src++;
-	       if(!strncmp(src, "<<", 2)){
-		    possibilities[i]->constraint = EARLIER;
-		    src += 2;
-	       }
-	       else if(!strncmp(src, "<=", 2)){
-		    possibilities[i]->constraint = EARLIER_EQUAL;
-		    src += 2;
-	       }
-	       else if(!strncmp(src, ">=", 2)){
-		    possibilities[i]->constraint = LATER_EQUAL;
-		    src += 2;
-	       }
-	       else if(!strncmp(src, ">>", 2)){
-		    possibilities[i]->constraint = LATER;
-		    src += 2;
-	       }
-	       else if(!strncmp(src, "=", 1)){
-		    possibilities[i]->constraint = EQUAL;
-		    src++;
-	       }
-	       /* should these be here to support deprecated designations; dpkg does */
-	       else if(!strncmp(src, "<", 1)){
-		    possibilities[i]->constraint = EARLIER_EQUAL;
-		    src++;
-	       }
-	       else if(!strncmp(src, ">", 1)){
-		    possibilities[i]->constraint = LATER_EQUAL;
-		    src++;
-	       }
+	       possibilities[i]->constraint = str_to_constraint(&src);
 
 	       /* now we have any constraint, pass space to version string */
 	       while(isspace(*src)) src++;
diff --git a/libopkg/pkg_depends.h b/libopkg/pkg_depends.h
index ca0801f..685a722 100644
--- a/libopkg/pkg_depends.h
+++ b/libopkg/pkg_depends.h
@@ -87,6 +87,7 @@ pkg_vec_t * pkg_hash_fetch_conflicts(pkg_t * pkg);
 int pkg_dependence_satisfiable(depend_t *depend);
 int pkg_dependence_satisfied(depend_t *depend);
 const char* constraint_to_str(enum version_constraint c);
+enum version_constraint str_to_constraint(char **str);
 int is_pkg_in_pkg_vec(pkg_vec_t * vec, pkg_t * pkg);
 
 #endif