git/sh-i18n--envsubst.c

/*
 * sh-i18n--envsubst.c - a stripped-down version of gettext's envsubst(1)
 *
 * Copyright (C) 2010 Ævar Arnfjörð Bjarmason
 *
 * This is a modified version of
 * 67d0871a8c:gettext-runtime/src/envsubst.c from the gettext.git
 * repository. It has been stripped down to only implement the
 * envsubst(1) features that we need in the git-sh-i18n fallbacks.
 *
 * The "Close standard error" part in main() is from
 * 8dac033df0:gnulib-local/lib/closeout.c. The copyright notices for
 * both files are reproduced immediately below.
 */

#include "git-compat-util.h"
#include "trace2.h"

/* Substitution of environment variables in shell format strings.
   Copyright (C) 2003-2007 Free Software Foundation, Inc.
   Written by Bruno Haible <[email protected]>, 2003.

   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 2, 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/>.  */

/* closeout.c - close standard output and standard error
   Copyright (C) 1998-2007 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 2, 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/>.  */

#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

/* If true, substitution shall be performed on all variables.  */
static unsigned short int all_variables;

/* Forward declaration of local functions.  */
static void print_variables (const char *string);
static void note_variables (const char *string);
static void subst_from_stdin (void);

int
cmd_main (int argc, const char *argv[])
{ … }

/* Parse the string and invoke the callback each time a $VARIABLE or
   ${VARIABLE} construct is seen, where VARIABLE is a nonempty sequence
   of ASCII alphanumeric/underscore characters, starting with an ASCII
   alphabetic/underscore character.
   We allow only ASCII characters, to avoid dependencies w.r.t. the current
   encoding: While "${\xe0}" looks like a variable access in ISO-8859-1
   encoding, it doesn't look like one in the BIG5, BIG5-HKSCS, GBK, GB18030,
   SHIFT_JIS, JOHAB encodings, because \xe0\x7d is a single character in these
   encodings.  */
static void
find_variables (const char *string,
		void (*callback) (const char *var_ptr, size_t var_len))
{ … }


/* Print a variable to stdout, followed by a newline.  */
static void
print_variable (const char *var_ptr, size_t var_len)
{ … }

/* Print the variables contained in STRING to stdout, each one followed by a
   newline.  */
static void
print_variables (const char *string)
{ … }


/* Type describing list of immutable strings,
   implemented using a dynamic array.  */
string_list_ty;
struct string_list_ty
{ … };

/* Initialize an empty list of strings.  */
static inline void
string_list_init (string_list_ty *slp)
{ … }

/* Append a single string to the end of a list of strings.  */
static inline void
string_list_append (string_list_ty *slp, const char *s)
{ … }

/* Compare two strings given by reference.  */
static int
cmp_string (const void *pstr1, const void *pstr2)
{ … }

/* Sort a list of strings.  */
static inline void
string_list_sort (string_list_ty *slp)
{ … }

/* Test whether a sorted string list contains a given string.  */
static int
sorted_string_list_member (const string_list_ty *slp, const char *s)
{ … }


/* Set of variables on which to perform substitution.
   Used only if !all_variables.  */
static string_list_ty variables_set;

/* Adds a variable to variables_set.  */
static void
note_variable (const char *var_ptr, size_t var_len)
{ … }

/* Stores the variables occurring in the string in variables_set.  */
static void
note_variables (const char *string)
{ … }


static int
do_getc (void)
{ … }

static inline void
do_ungetc (int c)
{ … }

/* Copies stdin to stdout, performing substitutions.  */
static void
subst_from_stdin (void)
{ … }