Add API for iterating over rpmps problems

lib/rpmps.c

@@ -40,6 +40,50 @@ int rpmpsNumProblems(rpmps ps)
     return numProblems;
 }
 
+rpmpsi rpmpsInitIterator(rpmps ps)
+{
+    rpmpsi psi = NULL;
+    if (ps != NULL) {
+	psi = xcalloc(1, sizeof(*psi));
+	psi->ps = rpmpsLink(ps, "iter ref");
+	psi->ix = -1;
+    }
+    return psi;
+}
+
+rpmpsi rpmpsFreeIterator(rpmpsi psi)
+{
+    if (psi != NULL) {
+	rpmpsUnlink(psi->ps, "iter unref");
+	free(psi);
+	psi = NULL;
+    }
+    return psi;
+}
+
+int rpmpsNextIterator(rpmpsi psi)
+{
+    int i = -1;
+
+    if (psi != NULL && ++psi->ix >= 0) {
+	if (psi->ix < rpmpsNumProblems(psi->ps)) {
+	    i = psi->ix;
+	} else {
+	    psi->ix = -1;
+	}	     
+    }
+    return i;
+}
+
+rpmProblem rpmpsProblem(rpmpsi psi)
+{
+    rpmProblem p = NULL;
+    if (psi != NULL && psi->ix >= 0 && psi->ix < rpmpsNumProblems(psi->ps)) {
+	p = psi->ps->probs + psi->ix;
+    } 
+    return p;
+}
+
 rpmps rpmpsCreate(void)
 {
     rpmps ps = xcalloc(1, sizeof(*ps));

lib/rpmps.h

@@ -24,6 +24,8 @@ typedef struct rpmProblem_s * rpmProblem;
  */
 typedef struct rpmps_s * rpmps;
 
+typedef struct rpmpsi_s * rpmpsi;
+
 /**
  * Enumerate transaction set problem types.
  */
@@ -62,6 +64,11 @@ struct rpmps_s {
     int nrefs;			/*!< Reference count. */
 };
 
+struct rpmpsi_s {
+    size_t ix;
+    rpmps ps;
+};
+
 /**
  * Return formatted string representation of a problem.
  * @param prob		rpm problem
@@ -103,6 +110,34 @@ rpmps XrpmpsLink (rpmps ps,
  */
 int rpmpsNumProblems(rpmps ps);
 
+/**
+ * Initialize problem set iterator.
+ * @param ps		problem set
+ * @return		problem set iterator
+ */
+rpmpsi rpmpsInitIterator(rpmps ps);
+
+/**
+ * Destroy problem set iterator.
+ * @param psi		problem set iterator
+ * @return		problem set iterator (NULL)
+ */
+rpmpsi rpmpsFreeIterator(rpmpsi psi);
+
+/**
+ * Return next problem set iterator index
+ * @param psi		problem set iterator
+ * @return		iterator index, -1 on termination
+ */
+int rpmpsNextIterator(rpmpsi psi);
+
+/**
+ * Return current problem from problem set
+ * @param psi		problem set iterator
+ * @return		current rpmProblem 
+ */
+rpmProblem rpmpsProblem(rpmpsi psi);
+
 /**
  * Create a problem set.
  * @return		new problem set