Teach md5sum and sha1sum to work the way other applets do so I don't have to

teach scripts/individual new tricks.  And while I'm at it, teach
scripts/individual other new tricks.  Now builds 198 applets, some of which
I should teach it to hardlink together because they're really the same app...

coreutils/md5_sha1_sum.c

@@ -81,12 +81,16 @@ static uint8_t *hash_file(const char *filename, hash_algo_t hash_algo)
 	return hash_value;
 }
 
-/* This could become a common function for md5 as well, by using md5_stream */
-static int hash_files(int argc, char **argv, hash_algo_t hash_algo)
+int md5_sha1_sum_main(int argc, char **argv)
 {
 	int return_value = EXIT_SUCCESS;
 	uint8_t *hash_value;
 	unsigned int flags;
+	hash_algo_t hash_algo = ENABLE_MD5SUM ?
+								(ENABLE_SHA1SUM ?
+									(**argv=='m' ? HASH_MD5 : HASH_SHA1)
+								: HASH_MD5)
+							: HASH_SHA1;
 
 	if (ENABLE_FEATURE_MD5_SHA1_SUM_CHECK)
 		flags = bb_getopt_ulflags(argc, argv, "scw");
@@ -178,17 +182,3 @@ static int hash_files(int argc, char **argv, hash_algo_t hash_algo)
 	}
 	return (return_value);
 }
-
-#ifdef CONFIG_MD5SUM
-int md5sum_main(int argc, char **argv)
-{
-	return (hash_files(argc, argv, HASH_MD5));
-}
-#endif
-
-#ifdef CONFIG_SHA1SUM
-int sha1sum_main(int argc, char **argv)
-{
-	return (hash_files(argc, argv, HASH_SHA1));
-}
-#endif

include/applets.h

@@ -179,7 +179,7 @@ USE_LSATTR(APPLET(lsattr, _BB_DIR_BIN, _BB_SUID_NEVER))
 USE_LSMOD(APPLET(lsmod, _BB_DIR_SBIN, _BB_SUID_NEVER))
 USE_UNLZMA(APPLET_ODDNAME(lzmacat, unlzma, _BB_DIR_USR_BIN, _BB_SUID_NEVER, lzmacat))
 USE_MAKEDEVS(APPLET(makedevs, _BB_DIR_SBIN, _BB_SUID_NEVER))
-USE_MD5SUM(APPLET(md5sum, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
+USE_MD5SUM(APPLET_ODDNAME(md5sum, md5_sha1_sum, _BB_DIR_USR_BIN, _BB_SUID_NEVER, md5sum))
 USE_MDEV(APPLET(mdev, _BB_DIR_SBIN, _BB_SUID_NEVER))
 USE_MESG(APPLET(mesg, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
 USE_MKDIR(APPLET(mkdir, _BB_DIR_BIN, _BB_SUID_NEVER))
@@ -245,7 +245,7 @@ USE_FEATURE_SH_IS_ASH(APPLET_NOUSAGE(sh, ash, _BB_DIR_BIN, _BB_SUID_NEVER))
 USE_FEATURE_SH_IS_HUSH(APPLET_NOUSAGE(sh, hush, _BB_DIR_BIN, _BB_SUID_NEVER))
 USE_FEATURE_SH_IS_LASH(APPLET_NOUSAGE(sh, lash, _BB_DIR_BIN, _BB_SUID_NEVER))
 USE_FEATURE_SH_IS_MSH(APPLET_NOUSAGE(sh, msh, _BB_DIR_BIN, _BB_SUID_NEVER))
-USE_SHA1SUM(APPLET(sha1sum, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
+USE_SHA1SUM(APPLET_ODDNAME(sha1sum, md5_sha1_sum, _BB_DIR_USR_BIN, _BB_SUID_NEVER, sha1sum))
 USE_SLEEP(APPLET(sleep, _BB_DIR_BIN, _BB_SUID_NEVER))
 USE_SORT(APPLET(sort, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
 USE_START_STOP_DAEMON(APPLET_ODDNAME(start-stop-daemon, start_stop_daemon, _BB_DIR_SBIN, _BB_SUID_NEVER, start_stop_daemon))

scripts/individual

@@ -1,5 +1,10 @@
 #!/bin/sh
 
+# Clear out the build directory.  (Make clean should do this instead of here.)
+
+rm -rf build
+mkdir build
+
 # Make our prerequisites.
 
 make busybox.links include/bb_config.h
@@ -12,15 +17,18 @@ cd libbb
 make
 cd ..
 
+# Same problem.
+
 cd archival/libunarchive
 make
 cd ../..
 
-# 146 applets build without any extra stuff.  The applet is one C file with
-# the same name as the corresponding applet, and all it needs to link against
-# is libbb.a.  However, 104 of them need more than that.
+# About 3/5 of the applets build from one .c file (with the same name as the
+# corresponding applet), and all it needs to link against.  However, to build
+# them all we need more than that.
+
+# Figure out which applets need extra libraries added to their command line.
 
-# dpkg_deb gzip
 function extra_libraries()
 {
   archival="ar bunzip2 unlzma cpio dpkg gunzip rpm2cpio rpm tar uncompress unzip dpkg_deb gzip "
@@ -28,34 +36,61 @@ function extra_libraries()
   then
     echo "archival/libunarchive/libunarchive.a"
   fi
+
+  # What needs -libm?
+
+  libm="awk dc "
+  if [ "${libm/$1 //}" != "${libm}" ]
+  then
+    echo "-lm"
+  fi
 }
-    
-  
 
-# Here are a few that build in a standard way.  Others are easy to get to
-# build, for example miscutils/dc needs -lm and most of loginutils/* needs
-# -lcrypt...
+# Query applets.h to figure out which need something funky
 
-rm -rf build
-mkdir build
+strange_names=`sed -rn -e 's/\#.*//' -e 's/.*APPLET_NOUSAGE\(([^,]*),([^,]*),.*/\1 \2/p' -e 's/.*APPLET_ODDNAME\(([^,]*),([^,]*),.*, *([^)]*).*/\1 \2@\3/p' include/applets.h`
+
+function bonkname()
+{
+  while [ $# -gt 0 ]
+  do
+    if [ "$APPLET" == "$1" ]
+    then
+      APPFILT="${2/@*/}"
+      if [ "${APPFILT}" == "$2" ]
+      then
+        HELPNAME='"nousage\n"'
+      else
+        HELPNAME="${2/*@/}"_full_usage
+      fi
+      break
+    fi
+    shift 2
+  done
+#echo APPLET=${APPLET} APPFILT=${APPFILT} HELPNAME=${HELPNAME} 2=${2}
+}
 
 for APPLET in `sed 's .*/  ' busybox.links`
 do
-  APPFILT=${APPLET/-/_}
-  j=`find . -name "${APPLET/-/?}.c"`  # Because ether-wake.c is broken.
+  export APPLET
+  export APPFILT=${APPLET}
+  export HELPNAME=${APPLET}_full_usage
+  bonkname $strange_names
+
+  j=`find . -name "${APPFILT}.c"`
   if [ -z "$j" ]
   then
     echo no file for $APPLET
   else
-    echo "Building $APPLET..."
+    echo "Building $APPLET"
     gcc -Os -o build/$APPLET applets/individual.c $j \
 	`extra_libraries $APPFILT` libbb/libbb.a -Iinclude \
 	-DBUILD_INDIVIDUAL \
 	"-Drun_applet_by_name(...)" "-Dfind_applet_by_name(...) 0" \
-	-DAPPLET_main=${APPFILT}_main -DAPPLET_full_usage=${APPFILT}_full_usage
+	-DAPPLET_main=${APPFILT}_main -DAPPLET_full_usage=${HELPNAME}
     if [ $? -ne 0 ];
     then
-      echo "Failed."
+      echo "Failed $APPLET"
     fi
   fi
 done