[libvirt] [PATCHv2 10/10] Replace sscanf in PCI device address parsing

[Matthias Bolte]

This also fixes a problem with MinGW's GCC on Windows.
GCC complained about the L modifier being unknown.

Parsing is stricter now and doesn't accept trailing characters
after the actual value anymore.

Change domain from unsigned long long to unsigned int in
pciWaitForDeviceCleanup, because everywhere else domain is
handled as unsigned int too.
---
 src/util/pci.c |   53 ++++++++++++++++++++++++++++++++++++++---------------
 1 files changed, 38 insertions(+), 15 deletions(-)

diff --git a/src/util/pci.c b/src/util/pci.c
index 99ec22a..640e9f8 100644
--- a/src/util/pci.c
+++ b/src/util/pci.c
@@ -282,15 +282,23 @@ pciIterDevices(pciIterPredicate predicate,
     }
 
     while ((entry = readdir(dir))) {
-        unsigned domain, bus, slot, function;
+        unsigned int domain, bus, slot, function;
         pciDevice *check;
+        char *tmp;
 
         /* Ignore '.' and '..' */
         if (entry->d_name[0] == '.')
             continue;
 
-        if (sscanf(entry->d_name, "%x:%x:%x.%x",
-                   &domain, &bus, &slot, &function) < 4) {
+        /* expected format: <domain>:<bus>:<slot>.<function> */
+        if (/* domain */
+            virStrToLong_ui(entry->d_name, &tmp, 16, &domain) < 0 || *tmp != ':' ||
+            /* bus */
+            virStrToLong_ui(tmp + 1, &tmp, 16, &bus) < 0 || *tmp != ':' ||
+            /* slot */
+            virStrToLong_ui(tmp + 1, &tmp, 16, &slot) < 0 || *tmp != '.' ||
+            /* function */
+            virStrToLong_ui(tmp + 1, NULL, 16, &function) < 0) {
             VIR_WARN("Unusual entry in " PCI_SYSFS "devices: %s", entry->d_name);
             continue;
         }
@@ -913,11 +921,9 @@ pciWaitForDeviceCleanup(pciDevice *dev, const char *matcher)
 {
     FILE *fp;
     char line[160];
+    char *tmp;
     unsigned long long start, end;
-    int consumed;
-    char *rest;
-    unsigned long long domain;
-    int bus, slot, function;
+    unsigned int domain, bus, slot, function;
     int in_matching_device;
     int ret;
     size_t match_depth;
@@ -945,22 +951,39 @@ pciWaitForDeviceCleanup(pciDevice *dev, const char *matcher)
          * of these situations
          */
         if (in_matching_device && (strspn(line, " ") == (match_depth + 2))) {
-            if (sscanf(line, "%Lx-%Lx : %n", &start, &end, &consumed) != 2)
+            tmp = line + strspn(line, " ");
+
+            /* expected format: <start>-<end> : <suffix> */
+            if (/* start */
+                virStrToLong_ull(tmp, &tmp, 16, &start) < 0 || *tmp != '-' ||
+                /* end */
+                virStrToLong_ull(tmp + 1, &tmp, 16, &end) < 0 ||
+                (tmp = STRSKIP(tmp, " : ")) == NULL)
                 continue;
 
-            rest = line + consumed;
-            if (STRPREFIX(rest, matcher)) {
+            if (STRPREFIX(tmp, matcher)) {
                 ret = 1;
                 break;
             }
         }
         else {
             in_matching_device = 0;
-            if (sscanf(line, "%Lx-%Lx : %n", &start, &end, &consumed) != 2)
-                continue;
-
-            rest = line + consumed;
-            if (sscanf(rest, "%Lx:%x:%x.%x", &domain, &bus, &slot, &function) != 4)
+            tmp = line + strspn(line, " ");
+
+            /* expected format: <start>-<end> : <domain>:<bus>:<slot>.<function> */
+            if (/* start */
+                virStrToLong_ull(tmp, &tmp, 16, &start) < 0 || *tmp != '-' ||
+                /* end */
+                virStrToLong_ull(tmp + 1, &tmp, 16, &end) < 0 ||
+                (tmp = STRSKIP(tmp, " : ")) == NULL ||
+                /* domain */
+                virStrToLong_ui(tmp, &tmp, 16, &domain) < 0 || *tmp != ':' ||
+                /* bus */
+                virStrToLong_ui(tmp + 1, &tmp, 16, &bus) < 0 || *tmp != ':' ||
+                /* slot */
+                virStrToLong_ui(tmp + 1, &tmp, 16, &slot) < 0 || *tmp != '.' ||
+                /* function */
+                virStrToLong_ui(tmp + 1, &tmp, 16, &function) < 0)
                 continue;
 
             if (domain != dev->domain || bus != dev->bus || slot != dev->slot ||
-- 
1.6.3.3