od: reduce data/bss usage (code size went down too)

1 files changed, 30 insertions, 41 deletions

diff --git a/coreutils/od_bloaty.c b/coreutils/od_bloaty.c
index 54029ff5b..4fb825ee7 100644
--- a/coreutils/od_bloaty.c
+++ b/coreutils/od_bloaty.c
@@ -181,14 +181,8 @@ static void (*format_address)(off_t, char);
 /* The difference between the old-style pseudo starting address and
    the number of bytes to skip.  */
 static off_t pseudo_offset;
-/* The number of input bytes to skip before formatting and writing.  */
-static off_t n_bytes_to_skip;
 /* When zero, MAX_BYTES_TO_FORMAT and END_OFFSET are ignored, and all
    input is formatted.  */
-/* The maximum number of bytes that will be formatted.  */
-static off_t max_bytes_to_format;
-/* The offset of the first byte after the last byte to be formatted.  */
-static off_t end_offset;
 
 /* The number of input bytes formatted per output line.  It must be
    a multiple of the least common multiple of the sizes associated with
@@ -196,22 +190,14 @@ static off_t end_offset;
    no larger than 16 -- unless specified with the -w option.  */
 static size_t bytes_per_block;
 
-/* Human-readable representation of *file_list (for error messages).
-   It differs from *file_list only when *file_list is "-".  */
-static char const *input_filename;
-
 /* A NULL-terminated list of the file-arguments from the command line.  */
-static char const *const *file_list;
-
-/* Initializer for file_list if no file-arguments
-   were specified on the command line.  */
-static char const *const default_file_list[] = { "-", NULL };
+static const char *const *file_list;
 
 /* The input stream associated with the current file.  */
 static FILE *in_stream;
 
 #define MAX_INTEGRAL_TYPE_SIZE sizeof(ulonglong_t)
-static unsigned char integral_type_size[MAX_INTEGRAL_TYPE_SIZE + 1] ALIGN1 = {
+static const unsigned char integral_type_size[MAX_INTEGRAL_TYPE_SIZE + 1] ALIGN1 = {
         [sizeof(char)] = CHAR,
 #if USHRT_MAX != UCHAR_MAX
         [sizeof(short)] = SHORT,
@@ -228,7 +214,7 @@ static unsigned char integral_type_size[MAX_INTEGRAL_TYPE_SIZE + 1] ALIGN1 = {
 };
 
 #define MAX_FP_TYPE_SIZE sizeof(longdouble_t)
-static unsigned char fp_type_size[MAX_FP_TYPE_SIZE + 1] ALIGN1 = {
+static const unsigned char fp_type_size[MAX_FP_TYPE_SIZE + 1] ALIGN1 = {
         /* gcc seems to allow repeated indexes. Last one stays */
         [sizeof(longdouble_t)] = FLOAT_LONG_DOUBLE,
         [sizeof(double)] = FLOAT_DOUBLE,
@@ -481,14 +467,10 @@ static void
 open_next_file(void)
 {
         while (1) {
-                input_filename = *file_list;
-                if (!input_filename)
+                if (!*file_list)
                         return;
-                file_list++;
-                in_stream = fopen_or_warn_stdin(input_filename);
+                in_stream = fopen_or_warn_stdin(*file_list++);
                 if (in_stream) {
-                        if (in_stream == stdin)
-                                input_filename = bb_msg_standard_input;
                         break;
                 }
                 ioerror = 1;
@@ -510,7 +492,10 @@ check_and_close(void)
 {
         if (in_stream) {
                 if (ferror(in_stream))  {
-                        bb_error_msg("%s: read error", input_filename);
+                        bb_error_msg("%s: read error", (in_stream == stdin)
+                                        ? bb_msg_standard_input
+                                        : file_list[-1]
+                        );
                         ioerror = 1;
                 }
                 fclose_if_not_stdin(in_stream);
@@ -804,8 +789,9 @@ skip(off_t n_skip)
                 } else {
                         /* If it's not a regular file with nonnegative size,
                            position the file pointer by reading.  */
-                        char buf[BUFSIZ];
-                        size_t n_bytes_read, n_bytes_to_read = BUFSIZ;
+                        char buf[1024];
+                        size_t n_bytes_to_read = 1024;
+                        size_t n_bytes_read;
 
                         while (n_skip > 0) {
                                 if (n_skip < n_bytes_to_read)
@@ -1019,18 +1005,15 @@ parse_old_offset(const char *s, off_t *offset)
    Otherwise, return zero.  */
 
 static void
-dump(void)
+dump(off_t current_offset, off_t end_offset)
 {
         char *block[2];
-        off_t current_offset;
         int idx;
         size_t n_bytes_read;
 
         block[0] = xmalloc(2*bytes_per_block);
         block[1] = block[0] + bytes_per_block;
 
-        current_offset = n_bytes_to_skip;
-
         idx = 0;
         if (limit_bytes_to_format) {
                 while (1) {
@@ -1133,11 +1116,10 @@ read_char(int *c)
    occurs.  Otherwise, return zero.  */
 
 static void
-dump_strings(void)
+dump_strings(off_t address, off_t end_offset)
 {
         size_t bufsize = MAX(100, string_min);
         char *buf = xmalloc(bufsize);
-        off_t address = n_bytes_to_skip;
 
         while (1) {
                 size_t i;
@@ -1169,7 +1151,7 @@ dump_strings(void)
                 if (i < string_min)             /* Too short! */
                         goto tryline;
 
-                /* If we get here, the string is all printable and null-terminated,
+                /* If we get here, the string is all printable and NUL-terminated,
                  * so print it.  It is all in 'buf' and 'i' is its length.  */
                 buf[i] = 0;
                 format_address(address - i - 1, ' ');
@@ -1183,7 +1165,7 @@ dump_strings(void)
                         case '\r': fputs("\\r", stdout); break;
                         case '\t': fputs("\\t", stdout); break;
                         case '\v': fputs("\\v", stdout); break;
-                        default: bb_putchar(c);
+                        default: putchar(c);
                         }
                 }
                 putchar('\n');
@@ -1199,17 +1181,13 @@ dump_strings(void)
 int od_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int od_main(int argc, char **argv)
 {
+        static char const *const default_file_list[] = { "-", NULL };
         static const struct suffix_mult bkm[] = {
                 { "b", 512 },
                 { "k", 1024 },
                 { "m", 1024*1024 },
                 { }
         };
-        unsigned opt;
-        int l_c_m;
-        /* The old-style 'pseudo starting address' to be printed in parentheses
-           after any true address.  */
-        off_t pseudo_start = 0; // only for gcc
         enum {
                 OPT_A = 1 << 0,
                 OPT_N = 1 << 1,
@@ -1246,6 +1224,17 @@ int od_main(int argc, char **argv)
         char *str_A, *str_N, *str_j, *str_S;
         char *str_w = NULL;
         llist_t *lst_t = NULL;
+        unsigned opt;
+        int l_c_m;
+        /* The old-style 'pseudo starting address' to be printed in parentheses
+           after any true address.  */
+        off_t pseudo_start = pseudo_start; // for gcc
+        /* The number of input bytes to skip before formatting and writing.  */
+        off_t n_bytes_to_skip = 0;
+        /* The offset of the first byte after the last byte to be formatted.  */
+        off_t end_offset = 0;
+        /* The maximum number of bytes that will be formatted.  */
+        off_t max_bytes_to_format = 0;
 
         spec = NULL;
         format_address = format_address_std;
@@ -1441,9 +1430,9 @@ int od_main(int argc, char **argv)
 #endif
 
         if (flag_dump_strings)
-                dump_strings();
+                dump_strings(n_bytes_to_skip, end_offset);
         else
-                dump();
+                dump(n_bytes_to_skip, end_offset);
 
         if (fclose(stdin) == EOF)
                 bb_perror_msg_and_die(bb_msg_standard_input);