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+/* argmatch.h -- definitions and prototypes for argmatch.c
+
+ Copyright (C) 1990, 1998-1999, 2001-2002, 2004-2005, 2009-2021 Free Software
+ Foundation, Inc.
+
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <https://www.gnu.org/licenses/>. */
+
+/* Written by David MacKenzie <djm@ai.mit.edu>
+ Modified by Akim Demaille <demaille@inf.enst.fr> */
+
+#ifndef ARGMATCH_H_
+# define ARGMATCH_H_ 1
+
+# include <limits.h>
+# include <stdbool.h>
+# include <stddef.h>
+# include <stdio.h>
+# include <string.h> /* memcmp */
+
+# include "gettext.h"
+# include "quote.h"
+# include "verify.h"
+
+# ifdef __cplusplus
+extern "C" {
+# endif
+
+# define ARRAY_CARDINALITY(Array) (sizeof (Array) / sizeof *(Array))
+
+/* Assert there are as many real arguments as there are values
+ (argument list ends with a NULL guard). */
+
+# define ARGMATCH_VERIFY(Arglist, Vallist) \
+ verify (ARRAY_CARDINALITY (Arglist) == ARRAY_CARDINALITY (Vallist) + 1)
+
+/* Return the index of the element of ARGLIST (NULL terminated) that
+ matches with ARG. If VALLIST is not NULL, then use it to resolve
+ false ambiguities (i.e., different matches of ARG but corresponding
+ to the same values in VALLIST). */
+
+ptrdiff_t argmatch (char const *arg, char const *const *arglist,
+ void const *vallist, size_t valsize) _GL_ATTRIBUTE_PURE;
+
+# define ARGMATCH(Arg, Arglist, Vallist) \
+ argmatch (Arg, Arglist, (void const *) (Vallist), sizeof *(Vallist))
+
+/* xargmatch calls this function when it fails. This function should not
+ return. By default, this is a function that calls ARGMATCH_DIE which
+ in turn defaults to 'exit (exit_failure)'. */
+typedef void (*argmatch_exit_fn) (void);
+extern argmatch_exit_fn argmatch_die;
+
+/* Report on stderr why argmatch failed. Report correct values. */
+
+void argmatch_invalid (char const *context, char const *value,
+ ptrdiff_t problem);
+
+/* Left for compatibility with the old name invalid_arg */
+
+# define invalid_arg(Context, Value, Problem) \
+ argmatch_invalid (Context, Value, Problem)
+
+
+
+/* Report on stderr the list of possible arguments. */
+
+void argmatch_valid (char const *const *arglist,
+ void const *vallist, size_t valsize);
+
+# define ARGMATCH_VALID(Arglist, Vallist) \
+ argmatch_valid (Arglist, (void const *) (Vallist), sizeof *(Vallist))
+
+
+
+/* Same as argmatch, but upon failure, report an explanation of the
+ failure, and exit using the function EXIT_FN. */
+
+ptrdiff_t __xargmatch_internal (char const *context,
+ char const *arg, char const *const *arglist,
+ void const *vallist, size_t valsize,
+ argmatch_exit_fn exit_fn);
+
+/* Programmer friendly interface to __xargmatch_internal. */
+
+# define XARGMATCH(Context, Arg, Arglist, Vallist) \
+ ((Vallist) [__xargmatch_internal (Context, Arg, Arglist, \
+ (void const *) (Vallist), \
+ sizeof *(Vallist), \
+ argmatch_die)])
+
+/* Convert a value into a corresponding argument. */
+
+char const *argmatch_to_argument (void const *value,
+ char const *const *arglist,
+ void const *vallist, size_t valsize)
+ _GL_ATTRIBUTE_PURE;
+
+# define ARGMATCH_TO_ARGUMENT(Value, Arglist, Vallist) \
+ argmatch_to_argument (Value, Arglist, \
+ (void const *) (Vallist), sizeof *(Vallist))
+
+# define ARGMATCH_DEFINE_GROUP(Name, Type) \
+ /* The type of the values of this group. */ \
+ typedef Type argmatch_##Name##_type; \
+ \
+ /* The size of the type of the values of this group. */ \
+ enum argmatch_##Name##_size_enum \
+ { \
+ argmatch_##Name##_size = sizeof (argmatch_##Name##_type) \
+ }; \
+ \
+ /* Argument mapping of this group. */ \
+ typedef struct \
+ { \
+ /* Argument (e.g., "simple"). */ \
+ const char *arg; \
+ /* Value (e.g., simple_backups). */ \
+ const argmatch_##Name##_type val; \
+ } argmatch_##Name##_arg; \
+ \
+ /* Documentation of this group. */ \
+ typedef struct \
+ { \
+ /* Argument (e.g., "simple"). */ \
+ const char *arg; \
+ /* Documentation (e.g., N_("always make simple backups")). */ \
+ const char *doc; \
+ } argmatch_##Name##_doc; \
+ \
+ /* All the features of an argmatch group. */ \
+ typedef struct \
+ { \
+ const argmatch_##Name##_arg* args; \
+ const argmatch_##Name##_doc* docs; \
+ \
+ /* Printed before the usage message. */ \
+ const char *doc_pre; \
+ /* Printed after the usage message. */ \
+ const char *doc_post; \
+ } argmatch_##Name##_group_type; \
+ \
+ /* The structure the user must build. */ \
+ extern const argmatch_##Name##_group_type argmatch_##Name##_group; \
+ \
+ /* Print the documentation of this group. */ \
+ void argmatch_##Name##_usage (FILE *out); \
+ \
+ /* If nonnegative, the index I of ARG in ARGS, i.e, \
+ ARGS[I] == ARG. \
+ Return -1 for invalid argument, -2 for ambiguous argument. */ \
+ ptrdiff_t argmatch_##Name##_choice (const char *arg); \
+ \
+ /* A pointer to the corresponding value if it exists, or \
+ report an error and exit with failure if the argument was \
+ not recognized. */ \
+ const argmatch_##Name##_type* \
+ argmatch_##Name##_value (const char *context, const char *arg); \
+ \
+ /* The first argument in ARGS that matches this value, or NULL. */ \
+ const char * \
+ argmatch_##Name##_argument (const argmatch_##Name##_type *val); \
+ \
+ ptrdiff_t \
+ argmatch_##Name##_choice (const char *arg) \
+ { \
+ const argmatch_##Name##_group_type *g = &argmatch_##Name##_group; \
+ size_t size = argmatch_##Name##_size; \
+ ptrdiff_t res = -1; /* Index of first nonexact match. */ \
+ bool ambiguous = false; /* Whether multiple nonexact match(es). */ \
+ size_t arglen = strlen (arg); \
+ \
+ /* Test all elements for either exact match or abbreviated \
+ matches. */ \
+ for (size_t i = 0; g->args[i].arg; i++) \
+ if (!strncmp (g->args[i].arg, arg, arglen)) \
+ { \
+ if (strlen (g->args[i].arg) == arglen) \
+ /* Exact match found. */ \
+ return i; \
+ else if (res == -1) \
+ /* First nonexact match found. */ \
+ res = i; \
+ else if (memcmp (&g->args[res].val, &g->args[i].val, size)) \
+ /* Second nonexact match found. */ \
+ /* There is a real ambiguity, or we could not \
+ disambiguate. */ \
+ ambiguous = true; \
+ } \
+ return ambiguous ? -2 : res; \
+ } \
+ \
+ const char * \
+ argmatch_##Name##_argument (const argmatch_##Name##_type *val) \
+ { \
+ const argmatch_##Name##_group_type *g = &argmatch_##Name##_group; \
+ size_t size = argmatch_##Name##_size; \
+ for (size_t i = 0; g->args[i].arg; i++) \
+ if (!memcmp (val, &g->args[i].val, size)) \
+ return g->args[i].arg; \
+ return NULL; \
+ } \
+ \
+ /* List the valid values of this group. */ \
+ static void \
+ argmatch_##Name##_valid (FILE *out) \
+ { \
+ const argmatch_##Name##_group_type *g = &argmatch_##Name##_group; \
+ size_t size = argmatch_##Name##_size; \
+ \
+ /* Try to put synonyms on the same line. Synonyms are expected \
+ to follow each other. */ \
+ fputs (gettext ("Valid arguments are:"), out); \
+ for (int i = 0; g->args[i].arg; i++) \
+ if (i == 0 \
+ || memcmp (&g->args[i-1].val, &g->args[i].val, size)) \
+ fprintf (out, "\n - %s", quote (g->args[i].arg)); \
+ else \
+ fprintf (out, ", %s", quote (g->args[i].arg)); \
+ putc ('\n', out); \
+ } \
+ \
+ const argmatch_##Name##_type* \
+ argmatch_##Name##_value (const char *context, const char *arg) \
+ { \
+ const argmatch_##Name##_group_type *g = &argmatch_##Name##_group; \
+ ptrdiff_t res = argmatch_##Name##_choice (arg); \
+ if (res < 0) \
+ { \
+ argmatch_invalid (context, arg, res); \
+ argmatch_##Name##_valid (stderr); \
+ argmatch_die (); \
+ } \
+ return &g->args[res].val; \
+ } \
+ \
+ /* The column in which the documentation is displayed. \
+ The leftmost possible, but no more than 20. */ \
+ static int \
+ argmatch_##Name##_doc_col (void) \
+ { \
+ const argmatch_##Name##_group_type *g = &argmatch_##Name##_group; \
+ size_t size = argmatch_##Name##_size; \
+ int res = 0; \
+ for (int i = 0; g->docs[i].arg; ++i) \
+ { \
+ int col = 4; \
+ int ival = argmatch_##Name##_choice (g->docs[i].arg); \
+ if (ival < 0) \
+ /* Pseudo argument, display it. */ \
+ col += strlen (g->docs[i].arg); \
+ else \
+ /* Genuine argument, display it with its synonyms. */ \
+ for (int j = 0; g->args[j].arg; ++j) \
+ if (! memcmp (&g->args[ival].val, &g->args[j].val, size)) \
+ col += (col == 4 ? 0 : 2) + strlen (g->args[j].arg); \
+ if (res <= col) \
+ res = col <= 20 ? col : 20; \
+ } \
+ return res ? res : 20; \
+ } \
+ \
+ void \
+ argmatch_##Name##_usage (FILE *out) \
+ { \
+ const argmatch_##Name##_group_type *g = &argmatch_##Name##_group; \
+ size_t size = argmatch_##Name##_size; \
+ /* Width of the screen. Help2man does not seem to support \
+ arguments on several lines, so in that case pretend a very \
+ large width. */ \
+ const int screen_width = getenv ("HELP2MAN") ? INT_MAX : 80; \
+ if (g->doc_pre) \
+ fprintf (out, "%s\n", gettext (g->doc_pre)); \
+ int doc_col = argmatch_##Name##_doc_col (); \
+ for (int i = 0; g->docs[i].arg; ++i) \
+ { \
+ int col = 0; \
+ bool first = true; \
+ int ival = argmatch_##Name##_choice (g->docs[i].arg); \
+ if (ival < 0) \
+ /* Pseudo argument, display it. */ \
+ col += fprintf (out, " %s", g->docs[i].arg); \
+ else \
+ /* Genuine argument, display it with its synonyms. */ \
+ for (int j = 0; g->args[j].arg; ++j) \
+ if (! memcmp (&g->args[ival].val, &g->args[j].val, size)) \
+ { \
+ if (!first \
+ && screen_width < col + 2 + strlen (g->args[j].arg)) \
+ { \
+ fprintf (out, ",\n"); \
+ col = 0; \
+ first = true; \
+ } \
+ if (first) \
+ { \
+ col += fprintf (out, " "); \
+ first = false; \
+ } \
+ else \
+ col += fprintf (out, ","); \
+ col += fprintf (out, " %s", g->args[j].arg); \
+ } \
+ /* The doc. Separated by at least two spaces. */ \
+ if (doc_col < col + 2) \
+ { \
+ fprintf (out, "\n"); \
+ col = 0; \
+ } \
+ fprintf (out, "%*s%s\n", \
+ doc_col - col, "", gettext (g->docs[i].doc)); \
+ } \
+ if (g->doc_post) \
+ fprintf (out, "%s\n", gettext (g->doc_post)); \
+ }
+
+# ifdef __cplusplus
+}
+# endif
+
+#endif /* ARGMATCH_H_ */
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