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From 8adbd2914ccd44e0b1766690b514bda213b88740 Mon Sep 17 00:00:00 2001
From: John Snow <jsnow@redhat.com>
Date: Mon, 23 Nov 2015 17:38:39 +0100
Subject: [PATCH 20/27] qemu-io: Correct error messages

RH-Author: John Snow <jsnow@redhat.com>
Message-id: <1448300320-7772-21-git-send-email-jsnow@redhat.com>
Patchwork-id: 68446
O-Subject: [RHEL-7.3 qemu-kvm PATCH v2 20/21] qemu-io: Correct error messages
Bugzilla: 1272523
RH-Acked-by: Thomas Huth <thuth@redhat.com>
RH-Acked-by: Laszlo Ersek <lersek@redhat.com>
RH-Acked-by: Max Reitz <mreitz@redhat.com>

Reported-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: John Snow <jsnow@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
(cherry picked from commit a9ecfa004f2dd83df612daac4a87dfc3a0feba28)
Signed-off-by: John Snow <jsnow@redhat.com>
Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>

Conflicts:
  qemu-io-cmds.c:
    - Fixes to sigraise are not backported.

Signed-off-by: John Snow <jsnow@redhat.com>
---
 qemu-io-cmds.c | 51 +++++++++++++++++++++++++++++++++------------------
 1 file changed, 33 insertions(+), 18 deletions(-)

diff --git a/qemu-io-cmds.c b/qemu-io-cmds.c
index 6ea027d..b41d6ee 100644
--- a/qemu-io-cmds.c
+++ b/qemu-io-cmds.c
@@ -134,6 +134,21 @@ static int64_t cvtnum(const char *s)
     return ret;
 }
 
+static void print_cvtnum_err(int64_t rc, const char *arg)
+{
+    switch (rc) {
+    case -EINVAL:
+        printf("Parsing error: non-numeric argument,"
+               " or extraneous/unrecognized suffix -- %s\n", arg);
+        break;
+    case -ERANGE:
+        printf("Parsing error: argument too large -- %s\n", arg);
+        break;
+    default:
+        printf("Parsing error: %s\n", arg);
+    }
+}
+
 #define EXABYTES(x)     ((long long)(x) << 60)
 #define PETABYTES(x)    ((long long)(x) << 50)
 #define TERABYTES(x)    ((long long)(x) << 40)
@@ -355,13 +370,13 @@ create_iovec(BlockDriverState *bs, QEMUIOVector *qiov, char **argv, int nr_iov,
 
         len = cvtnum(arg);
         if (len < 0) {
-            printf("non-numeric length argument -- %s\n", arg);
+            print_cvtnum_err(len, arg);
             goto fail;
         }
 
         /* should be SIZE_T_MAX, but that doesn't exist */
         if (len > INT_MAX) {
-            printf("too large length argument -- %s\n", arg);
+            printf("Argument '%s' exceeds maximum size %d\n", arg, INT_MAX);
             goto fail;
         }
 
@@ -688,7 +703,7 @@ static int read_f(BlockDriverState *bs, int argc, char **argv)
             lflag = 1;
             pattern_count = cvtnum(optarg);
             if (pattern_count < 0) {
-                printf("non-numeric length argument -- %s\n", optarg);
+                print_cvtnum_err(pattern_count, optarg);
                 return 0;
             }
             break;
@@ -709,7 +724,7 @@ static int read_f(BlockDriverState *bs, int argc, char **argv)
             sflag = 1;
             pattern_offset = cvtnum(optarg);
             if (pattern_offset < 0) {
-                printf("non-numeric length argument -- %s\n", optarg);
+                print_cvtnum_err(pattern_offset, optarg);
                 return 0;
             }
             break;
@@ -732,14 +747,14 @@ static int read_f(BlockDriverState *bs, int argc, char **argv)
 
     offset = cvtnum(argv[optind]);
     if (offset < 0) {
-        printf("non-numeric length argument -- %s\n", argv[optind]);
+        print_cvtnum_err(offset, argv[optind]);
         return 0;
     }
 
     optind++;
     count = cvtnum(argv[optind]);
     if (count < 0) {
-        printf("non-numeric length argument -- %s\n", argv[optind]);
+        print_cvtnum_err(count, argv[optind]);
         return 0;
     } else if (count > SIZE_MAX) {
         printf("length cannot exceed %" PRIu64 ", given %s\n",
@@ -894,7 +909,7 @@ static int readv_f(BlockDriverState *bs, int argc, char **argv)
 
     offset = cvtnum(argv[optind]);
     if (offset < 0) {
-        printf("non-numeric length argument -- %s\n", argv[optind]);
+        print_cvtnum_err(offset, argv[optind]);
         return 0;
     }
     optind++;
@@ -1043,14 +1058,14 @@ static int write_f(BlockDriverState *bs, int argc, char **argv)
 
     offset = cvtnum(argv[optind]);
     if (offset < 0) {
-        printf("non-numeric length argument -- %s\n", argv[optind]);
+        print_cvtnum_err(offset, argv[optind]);
         return 0;
     }
 
     optind++;
     count = cvtnum(argv[optind]);
     if (count < 0) {
-        printf("non-numeric length argument -- %s\n", argv[optind]);
+        print_cvtnum_err(count, argv[optind]);
         return 0;
     } else if (count > SIZE_MAX) {
         printf("length cannot exceed %" PRIu64 ", given %s\n",
@@ -1179,7 +1194,7 @@ static int writev_f(BlockDriverState *bs, int argc, char **argv)
 
     offset = cvtnum(argv[optind]);
     if (offset < 0) {
-        printf("non-numeric length argument -- %s\n", argv[optind]);
+        print_cvtnum_err(offset, argv[optind]);
         return 0;
     }
     optind++;
@@ -1306,7 +1321,7 @@ static int multiwrite_f(BlockDriverState *bs, int argc, char **argv)
         /* Read the offset of the request */
         offset = cvtnum(argv[optind]);
         if (offset < 0) {
-            printf("non-numeric offset argument -- %s\n", argv[optind]);
+            print_cvtnum_err(offset, argv[optind]);
             goto out;
         }
         optind++;
@@ -1526,7 +1541,7 @@ static int aio_read_f(BlockDriverState *bs, int argc, char **argv)
 
     ctx->offset = cvtnum(argv[optind]);
     if (ctx->offset < 0) {
-        printf("non-numeric length argument -- %s\n", argv[optind]);
+        print_cvtnum_err(ctx->offset, argv[optind]);
         g_free(ctx);
         return 0;
     }
@@ -1618,7 +1633,7 @@ static int aio_write_f(BlockDriverState *bs, int argc, char **argv)
 
     ctx->offset = cvtnum(argv[optind]);
     if (ctx->offset < 0) {
-        printf("non-numeric length argument -- %s\n", argv[optind]);
+        print_cvtnum_err(ctx->offset, argv[optind]);
         g_free(ctx);
         return 0;
     }
@@ -1676,7 +1691,7 @@ static int truncate_f(BlockDriverState *bs, int argc, char **argv)
 
     offset = cvtnum(argv[1]);
     if (offset < 0) {
-        printf("non-numeric truncate argument -- %s\n", argv[1]);
+        print_cvtnum_err(offset, argv[1]);
         return 0;
     }
 
@@ -1822,14 +1837,14 @@ static int discard_f(BlockDriverState *bs, int argc, char **argv)
 
     offset = cvtnum(argv[optind]);
     if (offset < 0) {
-        printf("non-numeric length argument -- %s\n", argv[optind]);
+        print_cvtnum_err(offset, argv[optind]);
         return 0;
     }
 
     optind++;
     count = cvtnum(argv[optind]);
     if (count < 0) {
-        printf("non-numeric length argument -- %s\n", argv[optind]);
+        print_cvtnum_err(count, argv[optind]);
         return 0;
     } else if (count >> BDRV_SECTOR_BITS > INT_MAX) {
         printf("length cannot exceed %"PRIu64", given %s\n",
@@ -1867,7 +1882,7 @@ static int alloc_f(BlockDriverState *bs, int argc, char **argv)
 
     offset = cvtnum(argv[1]);
     if (offset < 0) {
-        printf("non-numeric offset argument -- %s\n", argv[1]);
+        print_cvtnum_err(offset, argv[1]);
         return 0;
     } else if (offset & 0x1ff) {
         printf("offset %" PRId64 " is not sector aligned\n",
@@ -1878,7 +1893,7 @@ static int alloc_f(BlockDriverState *bs, int argc, char **argv)
     if (argc == 3) {
         nb_sectors = cvtnum(argv[2]);
         if (nb_sectors < 0) {
-            printf("non-numeric length argument -- %s\n", argv[2]);
+            print_cvtnum_err(nb_sectors, argv[2]);
             return 0;
         } else if (nb_sectors > INT_MAX) {
             printf("length argument cannot exceed %d, given %s\n",
-- 
1.8.3.1