add compare check with dd & diff

In case of that there is not available cmp with '-n', dd and diff
compoistion could be useful to compare two file.

diff <(dd bs=1 count=$bufsize if=$1 &>/dev/null) <(dd bs=1
count=$bufsize if=$2 &>/dev/null)

**Self evaluation:**
1. Build test:	 [X]Passed [ ]Failed [ ]Skipped
2. Run test:	 [X]Passed [ ]Failed [ ]Skipped

Signed-off-by: jijoong.moon <jijoong.moon@samsung.com>

diff --git a/ssat-api.sh b/ssat-api.sh
index de38937..1d1eafb 100644 (file)
--- a/ssat-api.sh
+++ b/ssat-api.sh
@@ -222,7 +222,8 @@ function callCompareTest() {
        # Try cmp.
        output=0
        command -v cmp
-       if (( $? == 0 ))
+       # If cmp is symlink, then it could be from busybox and it does not support "-n" option
+       if [[ $? == 0 && ! -L $(which cmp) ]]
        then
                # use cmp
                if (( $5 == 0 )); then
@@ -249,9 +250,21 @@ function callCompareTest() {
                fi
                testResult $output "$3" "$4" $6
        else
-               # use internal logic (slower!)
-               echo NYI
-               testResult 0 "$3" "Cannot test. cmp not found." $6
+           # use internal logic (slower!)
+           bufsize=`stat --printf="%s" $1`
+           if (( $5 == 2 )); then
+               bufsize=`stat --printf="%s" $2`
+           else
+               bufsize=$5
+           fi
+           diff <(dd bs=1 count=$bufsize if=$1 &>/dev/null) <(dd bs=1 count=$bufsize if=$2 &>/dev/null)
+           output=$?
+           if (( ${output} == 0 )); then
+               output=1
+           else
+               output=0
+           fi
+           testResult $output "$3" "$4" $6
        fi
 }