tests: Lower stack usage below 4096 bytes

Make virtTestLoadFile allocate the buffer to read the file into.

Fix logic error in virtTestLoadFile, stop reading on the first empty line.

Use virFileReadLimFD in virtTestCaptureProgramOutput to avoid manual
buffer handling.

1 files changed, 23 insertions, 16 deletions

diff --git a/tests/vmx2xmltest.c b/tests/vmx2xmltest.c
index 3b7e9be7c..e01e8ad03 100644
--- a/tests/vmx2xmltest.c
+++ b/tests/vmx2xmltest.c
@@ -11,11 +11,9 @@
 # include "testutils.h"
 # include "vmx/vmx.h"
 
-static virCapsPtr caps = NULL;
+static virCapsPtr caps;
 static virVMXContext ctx;
 
-# define MAX_FILE 4096
-
 static void
 testCapsInit(void)
 {
@@ -69,19 +67,17 @@ static int
 testCompareFiles(const char *vmx, const char *xml)
 {
     int result = -1;
-    char vmxData[MAX_FILE];
-    char xmlData[MAX_FILE];
+    char *vmxData = NULL;
+    char *xmlData = NULL;
     char *formatted = NULL;
-    char *vmxPtr = &(vmxData[0]);
-    char *xmlPtr = &(xmlData[0]);
     virDomainDefPtr def = NULL;
     virErrorPtr err = NULL;
 
-    if (virtTestLoadFile(vmx, &vmxPtr, MAX_FILE) < 0) {
+    if (virtTestLoadFile(vmx, &vmxData) < 0) {
         goto failure;
     }
 
-    if (virtTestLoadFile(xml, &xmlPtr, MAX_FILE) < 0) {
+    if (virtTestLoadFile(xml, &xmlData) < 0) {
         goto failure;
     }
 
@@ -109,6 +105,8 @@ testCompareFiles(const char *vmx, const char *xml)
     result = 0;
 
   failure:
+    VIR_FREE(vmxData);
+    VIR_FREE(xmlData);
     VIR_FREE(formatted);
     virDomainDefFree(def);
 
@@ -123,16 +121,25 @@ struct testInfo {
 static int
 testCompareHelper(const void *data)
 {
+    int result = -1;
     const struct testInfo *info = data;
-    char vmx[PATH_MAX];
-    char xml[PATH_MAX];
+    char *vmx = NULL;
+    char *xml = NULL;
+
+    if (virAsprintf(&vmx, "%s/vmx2xmldata/vmx2xml-%s.vmx", abs_srcdir,
+                    info->input) < 0 ||
+        virAsprintf(&xml, "%s/vmx2xmldata/vmx2xml-%s.xml", abs_srcdir,
+                    info->output) < 0) {
+        goto cleanup;
+    }
 
-    snprintf(vmx, PATH_MAX, "%s/vmx2xmldata/vmx2xml-%s.vmx", abs_srcdir,
-             info->input);
-    snprintf(xml, PATH_MAX, "%s/vmx2xmldata/vmx2xml-%s.xml", abs_srcdir,
-             info->output);
+    result = testCompareFiles(vmx, xml);
 
-    return testCompareFiles(vmx, xml);
+  cleanup:
+    VIR_FREE(vmx);
+    VIR_FREE(xml);
+
+    return result;
 }
 
 static char *