ash: eliminate 16 bytes in bss

[oweals/busybox.git] / applets / applet_tables.c

diff --git a/applets/applet_tables.c b/applets/applet_tables.c
index b5df74076db5dac747406b4add55977ec287770e..e48be46821e7ffe3a07cd33dcc4ca50a44371652 100644 (file)
--- a/applets/applet_tables.c
+++ b/applets/applet_tables.c
@@ -32,7 +32,7 @@ struct bb_applet {
 /* Define struct bb_applet applets[] */
 #include "../include/applets.h"
 
-enum { NUM_APPLETS = sizeof(applets)/sizeof(applets[0]) };
+enum { NUM_APPLETS = ARRAY_SIZE(applets) };
 
 static int offset[NUM_APPLETS];
 
@@ -47,48 +47,85 @@ int main(int argc, char **argv)
 {
        int i;
        int ofs;
+       unsigned MAX_APPLET_NAME_LEN = 1;
 
        qsort(applets, NUM_APPLETS, sizeof(applets[0]), cmp_name);
 
-       /* Keep in sync with include/busybox.h! */
-
-       puts("const char applet_names[] ALIGN1 =");
        ofs = 0;
-       i = 0;
        for (i = 0; i < NUM_APPLETS; i++) {
                offset[i] = ofs;
                ofs += strlen(applets[i].name) + 1;
+       }
+       /* We reuse 4 high-order bits of offset array for other purposes,
+        * so if they are indeed needed, refuse to proceed */
+       if (ofs > 0xfff)
+               return 1;
+       if (!argv[1])
+               return 1;
+
+       i = open(argv[1], O_WRONLY | O_TRUNC | O_CREAT, 0666);
+       if (i < 0)
+               return 1;
+       dup2(i, 1);
+
+       /* Keep in sync with include/busybox.h! */
+
+       printf("/* This is a generated file, don't edit */\n\n");
+
+       printf("#define NUM_APPLETS %u\n", NUM_APPLETS);
+       if (NUM_APPLETS == 1) {
+               printf("#define SINGLE_APPLET_STR \"%s\"\n", applets[0].name);
+               printf("#define SINGLE_APPLET_MAIN %s_main\n", applets[0].name);
+       }
+       printf("\n");
+
+       printf("#ifndef SKIP_definitions\n");
+       printf("const char applet_names[] ALIGN1 = \"\"\n");
+       for (i = 0; i < NUM_APPLETS; i++) {
                printf("\"%s\" \"\\0\"\n", applets[i].name);
+               if (MAX_APPLET_NAME_LEN < strlen(applets[i].name))
+                       MAX_APPLET_NAME_LEN = strlen(applets[i].name);
        }
-       puts(";");
+       printf(";\n\n");
 
-       puts("int (*const applet_mains[])(int argc, char **argv) = {");
+       printf("#ifndef SKIP_applet_main\n");
+       printf("int (*const applet_main[])(int argc, char **argv) = {\n");
        for (i = 0; i < NUM_APPLETS; i++) {
                printf("%s_main,\n", applets[i].main);
        }
-       puts("};");
+       printf("};\n");
+       printf("#endif\n\n");
 
-#if ENABLE_FEATURE_INSTALLER || ENABLE_FEATURE_PREFER_APPLETS
-       puts("const uint32_t applet_nameofs[] = {");
-#else
-       puts("const uint16_t applet_nameofs[] ALIGN2 = {");
-#endif
+       printf("const uint16_t applet_nameofs[] ALIGN2 = {\n");
        for (i = 0; i < NUM_APPLETS; i++) {
-               printf("0x%08x,\n",
+               printf("0x%04x,\n",
                        offset[i]
-#if ENABLE_FEATURE_SUID
-                       + (applets[i].need_suid   << 14) /* 2 bits */
-#endif
-#if ENABLE_FEATURE_INSTALLER
-                       + (applets[i].install_loc << 16) /* 3 bits */
-#endif
 #if ENABLE_FEATURE_PREFER_APPLETS
-                       + (applets[i].nofork << 19)
-                       + (applets[i].noexec << 20)
+                       + (applets[i].nofork << 12)
+                       + (applets[i].noexec << 13)
+#endif
+#if ENABLE_FEATURE_SUID
+                       + (applets[i].need_suid << 14) /* 2 bits */
 #endif
                );
        }
-       puts("};");
+       printf("};\n\n");
+
+#if ENABLE_FEATURE_INSTALLER
+       printf("const uint8_t applet_install_loc[] ALIGN1 = {\n");
+       i = 0;
+       while (i < NUM_APPLETS) {
+               int v = applets[i].install_loc; /* 3 bits */
+               if (++i < NUM_APPLETS)
+                       v |= applets[i].install_loc << 4; /* 3 bits */
+               printf("0x%02x,\n", v);
+               i++;
+       }
+       printf("};\n");
+#endif
+       printf("#endif /* SKIP_definitions */\n");
+       printf("\n");
+       printf("#define MAX_APPLET_NAME_LEN %u\n", MAX_APPLET_NAME_LEN);
 
        return 0;
 }