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0d98af2e1d
GCC 15 turned -Wincompatible-pointer-types into a compiler error instead
of a warning by default. This patch prevents the following error:
$ gcc manual/examples/subopt.c
manual/examples/subopt.c: In function ‘main’:
manual/examples/subopt.c:64:40: error: passing argument 2 of ‘getsubopt’ from incompatible pointer type [-Wincompatible-pointer-types]
64 | switch (getsubopt (&subopts, mount_opts, &value))
| ^~~~~~~~~~
| |
| const char **
In file included from manual/examples/subopt.c:19:
/usr/include/stdlib.h:1100:47: note: expected ‘char * const* restrict’ but argument is of type ‘const char **’
1100 | char *const *__restrict __tokens,
| ~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~
Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
96 lines
2.2 KiB
C
96 lines
2.2 KiB
C
/* Parsing of Suboptions Example
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Copyright (C) 1991-2025 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, see <https://www.gnu.org/licenses/>.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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int do_all;
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const char *type;
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int read_size;
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int write_size;
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int read_only;
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enum
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{
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RO_OPTION = 0,
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RW_OPTION,
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READ_SIZE_OPTION,
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WRITE_SIZE_OPTION,
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THE_END
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};
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const char *mount_opts[] =
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{
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[RO_OPTION] = "ro",
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[RW_OPTION] = "rw",
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[READ_SIZE_OPTION] = "rsize",
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[WRITE_SIZE_OPTION] = "wsize",
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[THE_END] = NULL
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};
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int
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main (int argc, char **argv)
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{
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char *subopts, *value;
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int opt;
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while ((opt = getopt (argc, argv, "at:o:")) != -1)
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switch (opt)
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{
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case 'a':
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do_all = 1;
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break;
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case 't':
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type = optarg;
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break;
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case 'o':
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subopts = optarg;
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while (*subopts != '\0')
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switch (getsubopt (&subopts, (char * const *) mount_opts, &value))
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{
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case RO_OPTION:
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read_only = 1;
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break;
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case RW_OPTION:
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read_only = 0;
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break;
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case READ_SIZE_OPTION:
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if (value == NULL)
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abort ();
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read_size = atoi (value);
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break;
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case WRITE_SIZE_OPTION:
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if (value == NULL)
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abort ();
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write_size = atoi (value);
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break;
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default:
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/* Unknown suboption. */
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printf ("Unknown suboption `%s'\n", value);
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break;
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}
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break;
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default:
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abort ();
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}
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/* Do the real work. */
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return 0;
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}
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