[libvirt] [PATCH 1/8] virsh: better support double quote

[Lai Jiangshan]

In origin code, double quote is only allowed at the begin or end
"complicated argument"
--some_opt="complicated string"  (we split this argument into 2 parts,
option and data, the data is "complicated string").

This patch makes it allow double quote at any position of
an argument:
complicated" argument"
complicated" "argument
--"some opt=complicated string"

This patch is also needed for the following patches,
the following patches will not split option argument into 2 parts,
so we have to allow double quote at any position of an argument.

Signed-off-by: Lai Jiangshan <laijs at cn.fujitsu.com>
---
diff --git a/tools/virsh.c b/tools/virsh.c
index 57ea618..7b6f2b6 100644
--- a/tools/virsh.c
+++ b/tools/virsh.c
@@ -10172,9 +10172,9 @@ static int
 vshCommandGetToken(vshControl *ctl, char *str, char **end, char **res)
 {
     int tk = VSH_TK_NONE;
-    int quote = FALSE;
+    bool double_quote = false;
     int sz = 0;
-    char *p = str;
+    char *p = str, *q;
     char *tkstr = NULL;
 
     *end = NULL;
@@ -10188,9 +10188,13 @@ vshCommandGetToken(vshControl *ctl, char *str, char **end, char **res)
         *end = ++p;             /* = \0 or begin of next command */
         return VSH_TK_END;
     }
+
+    q = p;
+    *res = NULL;
+copy:
     while (*p) {
         /* end of token is blank space or ';' */
-        if ((quote == FALSE && (*p == ' ' || *p == '\t')) || *p == ';')
+        if (!double_quote && (*p == ' ' || *p == '\t' || *p == ';'))
             break;
 
         /* end of option name could be '=' */
@@ -10206,23 +10210,22 @@ vshCommandGetToken(vshControl *ctl, char *str, char **end, char **res)
                 p += 2;
             } else {
                 tk = VSH_TK_DATA;
-                if (*p == '"') {
-                    quote = TRUE;
-                    p++;
-                } else {
-                    quote = FALSE;
-                }
             }
             tkstr = p;          /* begin of token */
-        } else if (quote && *p == '"') {
-            quote = FALSE;
+        }
+
+	if (*p == '"') {
+            double_quote = !double_quote;
             p++;
-            break;              /* end of "..." token */
+            continue;
         }
+
+        if (*res)
+            (*res)[sz] = *p;
         p++;
         sz++;
     }
-    if (quote) {
+    if (double_quote) {
         vshError(ctl, "%s", _("missing \""));
         return VSH_TK_ERROR;
     }
@@ -10231,8 +10234,12 @@ vshCommandGetToken(vshControl *ctl, char *str, char **end, char **res)
     if (sz == 0)
         return VSH_TK_END;
 
-    *res = vshMalloc(ctl, sz + 1);
-    memcpy(*res, tkstr, sz);
+    if (!*res) {
+        *res = vshMalloc(ctl, sz + 1);
+        sz = 0;
+        p = q;
+        goto copy;
+    }
     *(*res + sz) = '\0';
 
     *end = p;