cli: fix --memlimit-decompress= argument parsing

programs/zstdcli.c

@@ -1102,9 +1102,9 @@ int main(int argCount, const char* argv[])
                 }
 #endif
                 if (longCommandWArg(&argument, "--threads")) { NEXT_UINT32(nbWorkers); setThreads_non1 = (nbWorkers != 1); continue; }
+                if (longCommandWArg(&argument, "--memlimit-decompress")) { NEXT_UINT32(memLimit); continue; }
                 if (longCommandWArg(&argument, "--memlimit")) { NEXT_UINT32(memLimit); continue; }
                 if (longCommandWArg(&argument, "--memory")) { NEXT_UINT32(memLimit); continue; }
-                if (longCommandWArg(&argument, "--memlimit-decompress")) { NEXT_UINT32(memLimit); continue; }
                 if (longCommandWArg(&argument, "--block-size")) { NEXT_TSIZE(chunkSize); continue; } /* hidden command, prefer --split below */
                 if (longCommandWArg(&argument, "--split")) { NEXT_TSIZE(chunkSize); continue; }
                 if (longCommandWArg(&argument, "--jobsize")) { NEXT_TSIZE(chunkSize); continue; } /* note: overloaded variable */

tests/cli-tests/basic/memlimit_alias.sh

@@ -0,0 +1,15 @@
+#!/bin/sh
+set -eu
+
+datagen -g500K > input
+zstd -q input
+for option in --memlimit --memory --memlimit-decompress; do
+    zstd -dc "$option=8M" input.zst > output
+    cmp input output
+    zstd -dc "$option" 8M input.zst > output
+    cmp input output
+    if zstd -qdc "$option=1K" input.zst > output 2> error; then
+        die "Decompression exceeded the memory limit"
+    fi
+    grep -q 'Window size larger than maximum' error
+done