maint: replace each "for (;;)" with "while (true)"

Run this command:
  git ls-files | grep '\.[ch]$' \
    | xargs perl -pi -e 's/for \(;;\)/while (true)/g'
...except for randint.c, which does not include stdbool.h.
In that case, use "while (1)".
* gl/lib/randint.c (randint_genmax): Use "while (1)" for infloops.
* src/cat.c (simple_cat, cat): Use "while (true)" for infloops.
* gl/lib/randread.c (readsource, readisaac): Likewise.
* src/copy.c (copy_reg): Likewise.
* src/csplit.c (record_line_starts, process_regexp): Likewise.
* src/cut.c (set_fields): Likewise.
* src/dd.c (iread, parse_symbols): Likewise.
* src/df.c (find_mount_point, main): Likewise.
* src/du.c (main): Likewise.
* src/expand.c (expand): Likewise.
* src/factor.c (factor_using_division, do_stdin): Likewise.
* src/fmt.c (get_space): Likewise.
* src/ls.c (decode_switches): Likewise.
* src/od.c (main): Likewise.
* src/pr.c (main, read_line): Likewise.
* src/shred.c (dopass, genpattern): Likewise.
* src/sort.c (initbuf, fillbuf, getmonth, keycompare): Likewise.
* src/split.c (bytes_split, lines_split): Likewise.
* src/tac.c (tac_seekable): Likewise.
* src/test.c (and, or): Likewise.
* src/tr.c (squeeze_filter, main): Likewise.
* src/tsort.c (search_item): Likewise.
* src/unexpand.c (unexpand): Likewise.
* src/uniq.c (main): Likewise.
* src/yes.c (main): Likewise.

gl/lib/randint.c

@@ -125,7 +125,7 @@ randint_genmax (struct randint_source *s, randint genmax)
   randint randmax = s->randmax;
   randint choices = genmax + 1;
 
-  for (;;)
+  while (1)
     {
       if (randmax < genmax)
         {

gl/lib/randread.c

@@ -199,7 +199,7 @@ randread_set_handler_arg (struct randread_source *s, void const *handler_arg)
 static void
 readsource (struct randread_source *s, unsigned char *p, size_t size)
 {
-  for (;;)
+  while (true)
     {
       size_t inbytes = fread (p, sizeof *p, size, s->source);
       int fread_errno = errno;
@@ -221,7 +221,7 @@ readisaac (struct isaac *isaac, unsigned char *p, size_t size)
 {
   size_t inbytes = isaac->buffered;
 
-  for (;;)
+  while (true)
     {
       if (size <= inbytes)
         {

src/cat.c

@@ -160,7 +160,7 @@ simple_cat (
 
   /* Loop until the end of the file.  */
 
-  for (;;)
+  while (true)
     {
       /* Read a block of input.  */
 
@@ -269,7 +269,7 @@ cat (
 
   bpout = outbuf;
 
-  for (;;)
+  while (true)
     {
       do
         {
@@ -424,7 +424,7 @@ cat (
          scan for chars that need conversion.  */
       if (show_nonprinting)
         {
-          for (;;)
+          while (true)
             {
               if (ch >= 32)
                 {
@@ -475,7 +475,7 @@ cat (
       else
         {
           /* Not quoting, neither of -v, -e, or -t specified.  */
-          for (;;)
+          while (true)
             {
               if (ch == '\t' && show_tabs)
                 {

src/copy.c

@@ -707,7 +707,7 @@ copy_reg (char const *src_name, char const *dst_name,
       buf_alloc = xmalloc (buf_size + buf_alignment_slop);
       buf = ptr_align (buf_alloc, buf_alignment);
 
-      for (;;)
+      while (true)
         {
           word *wp = NULL;
 

src/csplit.c

@@ -342,7 +342,7 @@ record_line_starts (struct buffer_record *b)
   line_start = b->buffer;
   bytes_left = b->bytes_used;
 
-  for (;;)
+  while (true)
     {
       line_end = memchr (line_start, '\n', bytes_left);
       if (line_end == NULL)
@@ -773,7 +773,7 @@ process_regexp (struct control *p, uintmax_t repetition)
 
   if (p->offset >= 0)
     {
-      for (;;)
+      while (true)
         {
           line = find_line (++current_line);
           if (line == NULL)
@@ -813,7 +813,7 @@ process_regexp (struct control *p, uintmax_t repetition)
   else
     {
       /* Buffer the lines. */
-      for (;;)
+      while (true)
         {
           line = find_line (++current_line);
           if (line == NULL)

src/cut.c

@@ -358,7 +358,7 @@ set_fields (const char *fieldstr)
   /* Collect and store in RP the range end points.
      It also sets EOL_RANGE_START if appropriate.  */
 
-  for (;;)
+  while (true)
     {
       if (*fieldstr == '-')
         {

src/dd.c

@@ -796,7 +796,7 @@ process_signals (void)
 static ssize_t
 iread (int fd, char *buf, size_t size)
 {
-  for (;;)
+  while (true)
     {
       ssize_t nread;
       process_signals ();
@@ -926,7 +926,7 @@ parse_symbols (char const *str, struct symbol_value const *table,
 {
   int value = 0;
 
-  for (;;)
+  while (true)
     {
       char const *strcomma = strchr (str, ',');
       struct symbol_value const *entry;

src/df.c

@@ -574,7 +574,7 @@ find_mount_point (const char *file, const struct stat *file_stat)
   /* Now walk up FILE's parents until we find another file system or /,
      chdiring as we go.  LAST_STAT holds stat information for the last place
      we visited.  */
-  for (;;)
+  while (true)
     {
       struct stat st;
       if (stat ("..", &st) < 0)
@@ -873,7 +873,7 @@ main (int argc, char **argv)
   print_grand_total = false;
   grand_fsu.fsu_blocksize = 1;
 
-  for (;;)
+  while (true)
     {
       int oi = -1;
       int c = getopt_long (argc, argv, "aB:iF:hHklmPTt:vx:", long_options,

src/du.c

@@ -690,7 +690,7 @@ main (int argc, char **argv)
   human_options (getenv ("DU_BLOCK_SIZE"),
                  &human_output_opts, &output_block_size);
 
-  for (;;)
+  while (true)
     {
       int oi = -1;
       int c = getopt_long (argc, argv, "0abd:chHklmsxB:DLPSX:",

src/expand.c

@@ -270,7 +270,7 @@ expand (void)
   if (!fp)
     return;
 
-  for (;;)
+  while (true)
     {
       /* Input character, or EOF.  */
       int c;
@@ -306,7 +306,7 @@ expand (void)
                   if (tab_size)
                     next_tab_column = column + (tab_size - column % tab_size);
                   else
-                    for (;;)
+                    while (true)
                       if (tab_index == first_free_tab)
                         {
                           next_tab_column = column + 1;

src/factor.c

@@ -107,7 +107,7 @@ factor_using_division (mpz_t t, unsigned int limit)
       --f;
     }
 
-  for (;;)
+  while (true)
     {
       mpz_tdiv_qr_ui (q, r, t, 3);
       if (mpz_cmp_ui (r, 0) != 0)
@@ -116,7 +116,7 @@ factor_using_division (mpz_t t, unsigned int limit)
       emit_ul_factor (3);
     }
 
-  for (;;)
+  while (true)
     {
       mpz_tdiv_qr_ui (q, r, t, 5);
       if (mpz_cmp_ui (r, 0) != 0)
@@ -516,7 +516,7 @@ do_stdin (void)
 
   init_tokenbuffer (&tokenbuffer);
 
-  for (;;)
+  while (true)
     {
       size_t token_length = readtoken (stdin, DELIM, sizeof (DELIM) - 1,
                                        &tokenbuffer);

src/fmt.c

@@ -728,7 +728,7 @@ get_prefix (FILE *f)
 static int
 get_space (FILE *f, int c)
 {
-  for (;;)
+  while (true)
     {
       if (c == ' ')
         in_column++;

src/ls.c

@@ -1635,7 +1635,7 @@ decode_switches (int argc, char **argv)
       }
   }
 
-  for (;;)
+  while (true)
     {
       int oi = -1;
       int c = getopt_long (argc, argv,

src/od.c

@@ -1564,7 +1564,7 @@ main (int argc, char **argv)
   address_pad_len = 7;
   flag_dump_strings = false;
 
-  for (;;)
+  while (true)
     {
       uintmax_t tmp;
       enum strtol_error s_err;

src/pr.c

@@ -876,7 +876,7 @@ main (int argc, char **argv)
                 ? xmalloc ((argc - 1) * sizeof (char *))
                 : NULL);
 
-  for (;;)
+  while (true)
     {
       int oi = -1;
       int c = getopt_long (argc, argv, short_options, long_options, &oi);
@@ -2526,7 +2526,7 @@ read_line (COLUMN *p)
 
   print_clump (p, chars, clump_buff);
 
-  for (;;)
+  while (true)
     {
       c = getc (p->fp);
 

src/shred.c

@@ -417,7 +417,7 @@ dopass (int fd, char const *qname, off_t *sizep, int type,
     }
 
   offset = 0;
-  for (;;)
+  while (true)
     {
       /* How much to write this time? */
       lim = sizeof r;
@@ -664,7 +664,7 @@ genpattern (int *dest, size_t num, struct randint_source *s)
   d = dest;			/* Destination for generated pass list */
   n = num;			/* Passes remaining to fill */
 
-  for (;;)
+  while (true)
     {
       k = *p++;			/* Block descriptor word */
       if (!k)

src/sort.c

@@ -1453,7 +1453,7 @@ initbuf (struct buffer *buf, size_t line_bytes, size_t alloc)
      size cannot be allocated, repeatedly halve it until allocation
      succeeds.  The smaller allocation may hurt overall performance,
      but that's better than failing.  */
-  for (;;)
+  while (true)
     {
       alloc += sizeof (struct line) - alloc % sizeof (struct line);
       buf->buf = malloc (alloc);
@@ -1646,7 +1646,7 @@ fillbuf (struct buffer *buf, FILE *fp, char const *file)
       buf->nlines = 0;
     }
 
-  for (;;)
+  while (true)
     {
       char *ptr = buf->buf + buf->used;
       struct line *linelim = buffer_linelim (buf);
@@ -1918,7 +1918,7 @@ getmonth (char const *month, size_t len, char const **ea)
   size_t hi = MONTHS_PER_YEAR;
   char const *monthlim = month + len;
 
-  for (;;)
+  while (true)
     {
       if (month == monthlim)
         return 0;
@@ -2340,7 +2340,7 @@ keycompare (const struct line *a, const struct line *b, bool show_debug)
 
   int diff;
 
-  for (;;)
+  while (true)
     {
       char const *translate = key->translate;
       bool const *ignore = key->ignore;
@@ -2445,7 +2445,7 @@ keycompare (const struct line *a, const struct line *b, bool show_debug)
 #define CMP_WITH_IGNORE(A, B)						\
   do									\
     {									\
-          for (;;)							\
+          while (true)							\
             {								\
               while (texta < lima && ignore[to_uchar (*texta)])		\
                 ++texta;						\
@@ -2960,7 +2960,7 @@ mergelines (struct line *t,
             struct line const *lo, size_t nlo,
             struct line const *hi, size_t nhi)
 {
-  for (;;)
+  while (true)
     if (compare (lo - 1, hi - 1, false) <= 0)
       {
         *--t = *--lo;
@@ -3210,7 +3210,7 @@ merge (struct sortfile *files, size_t ntemps, size_t nfiles,
      try to merge into the output, and then merge as much as we can into a
      temp file if we can't. Repeat.  */
 
-  for (;;)
+  while (true)
     {
       /* Merge directly into the output file if possible.  */
       FILE **fps;
@@ -3648,7 +3648,7 @@ main (int argc, char **argv)
 
   files = xnmalloc (argc, sizeof *files);
 
-  for (;;)
+  while (true)
     {
       /* Parse an operand as a file after "--" was seen; or if
          pedantic and a file was seen, unless the POSIX version

src/split.c

@@ -233,7 +233,7 @@ bytes_split (uintmax_t n_bytes, char *buf, size_t bufsize)
         error (EXIT_FAILURE, errno, "%s", infile);
       bp_out = buf;
       to_read = n_read;
-      for (;;)
+      while (true)
         {
           if (to_read < to_write)
             {
@@ -278,7 +278,7 @@ lines_split (uintmax_t n_lines, char *buf, size_t bufsize)
       bp = bp_out = buf;
       eob = bp + n_read;
       *eob = '\n';
-      for (;;)
+      while (true)
         {
           bp = memchr (bp, '\n', eob - bp + 1);
           if (bp == eob)

src/tac.c

@@ -245,7 +245,7 @@ tac_seekable (int input_fd, const char *file)
   if (sentinel_length)
     match_start -= match_length1;
 
-  for (;;)
+  while (true)
     {
       /* Search backward from `match_start' - 1 to `G_buffer' for a match
          with `separator'; for speed, use strncmp if `separator' contains no

src/test.c

@@ -511,7 +511,7 @@ and (void)
 {
   bool value = true;
 
-  for (;;)
+  while (true)
     {
       value &= term ();
       if (! (pos < argc && STREQ (argv[pos], "-a")))
@@ -530,7 +530,7 @@ or (void)
 {
   bool value = false;
 
-  for (;;)
+  while (true)
     {
       value |= and ();
       if (! (pos < argc && STREQ (argv[pos], "-o")))

src/tr.c

@@ -1489,7 +1489,7 @@ squeeze_filter (char *buf, size_t size, size_t (*reader) (char *, size_t))
   size_t i = 0;
   size_t nr = 0;
 
-  for (;;)
+  while (true)
     {
       size_t begin;
 
@@ -1763,7 +1763,7 @@ main (int argc, char **argv)
     {
       set_initialize (s1, complement, in_delete_set);
 
-      for (;;)
+      while (true)
         {
           size_t nr = read_and_delete (io_buf, sizeof io_buf);
           if (nr == 0)
@@ -1817,7 +1817,7 @@ main (int argc, char **argv)
             xlate[i] = i;
           s1->state = BEGIN_STATE;
           s2->state = BEGIN_STATE;
-          for (;;)
+          while (true)
             {
               /* When the previous pair identified case-converting classes,
                  advance S1 and S2 so that each points to the following
@@ -1877,7 +1877,7 @@ main (int argc, char **argv)
         }
       else
         {
-          for (;;)
+          while (true)
             {
               size_t bytes_read = read_and_xlate (io_buf, sizeof io_buf);
               if (bytes_read == 0)

src/tsort.c

@@ -136,7 +136,7 @@ search_item (struct item *root, const char *str)
   t = root;
   s = p = root->right;
 
-  for (;;)
+  while (true)
     {
       /* A2. Compare.  */
       a = strcmp (str, p->str);

src/unexpand.c

@@ -299,7 +299,7 @@ unexpand (void)
      allocate MAX_COLUMN_WIDTH bytes to store the blanks.  */
   pending_blank = xmalloc (max_column_width);
 
-  for (;;)
+  while (true)
     {
       /* Input character, or EOF.  */
       int c;
@@ -351,7 +351,7 @@ unexpand (void)
                         next_tab_column =
                           column + (tab_size - column % tab_size);
                       else
-                        for (;;)
+                        while (true)
                           if (tab_index == first_free_tab)
                             {
                               convert = false;

src/uniq.c

@@ -434,7 +434,7 @@ main (int argc, char **argv)
   countmode = count_none;
   delimit_groups = DM_NONE;
 
-  for (;;)
+  while (true)
     {
       /* Parse an operand with leading "+" as a file after "--" was
          seen; or if pedantic and a file was seen; or if not

src/yes.c

@@ -78,7 +78,7 @@ main (int argc, char **argv)
       argv[argc++] = bad_cast ("y");
     }
 
-  for (;;)
+  while (true)
     {
       int i;
       for (i = optind; i < argc; i++)