427 lines
10 KiB
C
427 lines
10 KiB
C
/*
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* sh-i18n--envsubst.c - a stripped-down version of gettext's envsubst(1)
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*
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* Copyright (C) 2010 Ævar Arnfjörð Bjarmason
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*
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* This is a modified version of
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* 67d0871a8c:gettext-runtime/src/envsubst.c from the gettext.git
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* repository. It has been stripped down to only implement the
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* envsubst(1) features that we need in the git-sh-i18n fallbacks.
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*
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* The "Close standard error" part in main() is from
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* 8dac033df0:gnulib-local/lib/closeout.c. The copyright notices for
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* both files are reproduced immediately below.
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*/
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#include "git-compat-util.h"
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#include "trace2.h"
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/* Substitution of environment variables in shell format strings.
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Copyright (C) 2003-2007 Free Software Foundation, Inc.
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Written by Bruno Haible <bruno@clisp.org>, 2003.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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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 <http://www.gnu.org/licenses/>. */
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/* closeout.c - close standard output and standard error
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Copyright (C) 1998-2007 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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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 <http://www.gnu.org/licenses/>. */
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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/* If true, substitution shall be performed on all variables. */
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static unsigned short int all_variables;
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/* Forward declaration of local functions. */
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static void print_variables (const char *string);
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static void note_variables (const char *string);
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static void subst_from_stdin (void);
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int
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cmd_main (int argc, const char *argv[])
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{
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/* Default values for command line options. */
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/* unsigned short int show_variables = 0; */
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trace2_cmd_name("sh-i18n--envsubst");
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switch (argc)
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{
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case 1:
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error ("we won't substitute all variables on stdin for you");
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break;
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/*
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all_variables = 1;
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subst_from_stdin ();
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*/
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case 2:
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/* echo '$foo and $bar' | git sh-i18n--envsubst --variables '$foo and $bar' */
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all_variables = 0;
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note_variables (argv[1]);
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subst_from_stdin ();
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break;
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case 3:
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/* git sh-i18n--envsubst --variables '$foo and $bar' */
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if (strcmp(argv[1], "--variables"))
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error ("first argument must be --variables when two are given");
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/* show_variables = 1; */
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print_variables (argv[2]);
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break;
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default:
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error ("too many arguments");
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break;
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}
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/* Close standard error. This is simpler than fwriteerror_no_ebadf, because
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upon failure we don't need an errno - all we can do at this point is to
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set an exit status. */
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errno = 0;
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if (ferror (stderr) || fflush (stderr))
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{
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fclose (stderr);
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exit (EXIT_FAILURE);
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}
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if (fclose (stderr) && errno != EBADF)
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exit (EXIT_FAILURE);
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exit (EXIT_SUCCESS);
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}
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/* Parse the string and invoke the callback each time a $VARIABLE or
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${VARIABLE} construct is seen, where VARIABLE is a nonempty sequence
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of ASCII alphanumeric/underscore characters, starting with an ASCII
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alphabetic/underscore character.
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We allow only ASCII characters, to avoid dependencies w.r.t. the current
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encoding: While "${\xe0}" looks like a variable access in ISO-8859-1
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encoding, it doesn't look like one in the BIG5, BIG5-HKSCS, GBK, GB18030,
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SHIFT_JIS, JOHAB encodings, because \xe0\x7d is a single character in these
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encodings. */
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static void
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find_variables (const char *string,
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void (*callback) (const char *var_ptr, size_t var_len))
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{
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for (; *string != '\0';)
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if (*string++ == '$')
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{
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const char *variable_start;
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const char *variable_end;
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unsigned short int valid;
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char c;
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if (*string == '{')
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string++;
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variable_start = string;
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c = *string;
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if ((c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z') || c == '_')
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{
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do
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c = *++string;
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while ((c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z')
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|| (c >= '0' && c <= '9') || c == '_');
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variable_end = string;
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if (variable_start[-1] == '{')
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{
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if (*string == '}')
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{
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string++;
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valid = 1;
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}
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else
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valid = 0;
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}
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else
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valid = 1;
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if (valid)
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callback (variable_start, variable_end - variable_start);
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}
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}
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}
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/* Print a variable to stdout, followed by a newline. */
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static void
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print_variable (const char *var_ptr, size_t var_len)
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{
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fwrite (var_ptr, var_len, 1, stdout);
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putchar ('\n');
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}
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/* Print the variables contained in STRING to stdout, each one followed by a
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newline. */
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static void
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print_variables (const char *string)
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{
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find_variables (string, &print_variable);
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}
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/* Type describing list of immutable strings,
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implemented using a dynamic array. */
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typedef struct string_list_ty string_list_ty;
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struct string_list_ty
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{
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const char **item;
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size_t nitems;
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size_t nitems_max;
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};
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/* Initialize an empty list of strings. */
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static inline void
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string_list_init (string_list_ty *slp)
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{
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slp->item = NULL;
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slp->nitems = 0;
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slp->nitems_max = 0;
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}
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/* Append a single string to the end of a list of strings. */
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static inline void
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string_list_append (string_list_ty *slp, const char *s)
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{
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/* Grow the list. */
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if (slp->nitems >= slp->nitems_max)
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{
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slp->nitems_max = slp->nitems_max * 2 + 4;
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REALLOC_ARRAY(slp->item, slp->nitems_max);
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}
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/* Add the string to the end of the list. */
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slp->item[slp->nitems++] = s;
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}
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/* Compare two strings given by reference. */
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static int
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cmp_string (const void *pstr1, const void *pstr2)
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{
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const char *str1 = *(const char **)pstr1;
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const char *str2 = *(const char **)pstr2;
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return strcmp (str1, str2);
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}
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/* Sort a list of strings. */
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static inline void
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string_list_sort (string_list_ty *slp)
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{
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QSORT(slp->item, slp->nitems, cmp_string);
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}
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/* Test whether a sorted string list contains a given string. */
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static int
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sorted_string_list_member (const string_list_ty *slp, const char *s)
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{
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size_t j1, j2;
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j1 = 0;
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j2 = slp->nitems;
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if (j2 > 0)
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{
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/* Binary search. */
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while (j2 - j1 > 1)
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{
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/* Here we know that if s is in the list, it is at an index j
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with j1 <= j < j2. */
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size_t j = j1 + ((j2 - j1) >> 1);
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int result = strcmp (slp->item[j], s);
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if (result > 0)
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j2 = j;
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else if (result == 0)
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return 1;
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else
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j1 = j + 1;
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}
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if (j2 > j1)
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if (strcmp (slp->item[j1], s) == 0)
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return 1;
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}
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return 0;
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}
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/* Set of variables on which to perform substitution.
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Used only if !all_variables. */
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static string_list_ty variables_set;
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/* Adds a variable to variables_set. */
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static void
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note_variable (const char *var_ptr, size_t var_len)
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{
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char *string = xmemdupz (var_ptr, var_len);
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string_list_append (&variables_set, string);
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}
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/* Stores the variables occurring in the string in variables_set. */
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static void
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note_variables (const char *string)
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{
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string_list_init (&variables_set);
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find_variables (string, ¬e_variable);
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string_list_sort (&variables_set);
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}
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static int
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do_getc (void)
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{
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int c = getc (stdin);
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if (c == EOF)
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{
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if (ferror (stdin))
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error ("error while reading standard input");
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}
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return c;
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}
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static inline void
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do_ungetc (int c)
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{
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if (c != EOF)
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ungetc (c, stdin);
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}
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/* Copies stdin to stdout, performing substitutions. */
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static void
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subst_from_stdin (void)
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{
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static char *buffer;
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static size_t bufmax;
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static size_t buflen;
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int c;
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for (;;)
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{
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c = do_getc ();
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if (c == EOF)
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break;
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/* Look for $VARIABLE or ${VARIABLE}. */
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if (c == '$')
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{
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unsigned short int opening_brace = 0;
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unsigned short int closing_brace = 0;
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c = do_getc ();
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if (c == '{')
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{
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opening_brace = 1;
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c = do_getc ();
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}
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if ((c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z') || c == '_')
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{
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unsigned short int valid;
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/* Accumulate the VARIABLE in buffer. */
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buflen = 0;
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do
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{
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if (buflen >= bufmax)
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{
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bufmax = 2 * bufmax + 10;
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buffer = xrealloc (buffer, bufmax);
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}
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buffer[buflen++] = c;
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c = do_getc ();
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}
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while ((c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z')
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|| (c >= '0' && c <= '9') || c == '_');
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if (opening_brace)
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{
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if (c == '}')
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{
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closing_brace = 1;
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valid = 1;
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}
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else
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{
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valid = 0;
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do_ungetc (c);
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}
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}
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else
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{
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valid = 1;
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do_ungetc (c);
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}
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if (valid)
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{
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/* Terminate the variable in the buffer. */
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if (buflen >= bufmax)
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{
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bufmax = 2 * bufmax + 10;
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buffer = xrealloc (buffer, bufmax);
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}
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buffer[buflen] = '\0';
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/* Test whether the variable shall be substituted. */
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if (!all_variables
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&& !sorted_string_list_member (&variables_set, buffer))
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valid = 0;
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}
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if (valid)
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{
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/* Substitute the variable's value from the environment. */
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const char *env_value = getenv (buffer);
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if (env_value != NULL)
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fputs (env_value, stdout);
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}
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else
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{
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/* Perform no substitution at all. Since the buffered input
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contains no other '$' than at the start, we can just
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output all the buffered contents. */
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putchar ('$');
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if (opening_brace)
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putchar ('{');
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fwrite (buffer, buflen, 1, stdout);
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if (closing_brace)
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putchar ('}');
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}
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}
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else
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{
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do_ungetc (c);
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putchar ('$');
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if (opening_brace)
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putchar ('{');
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}
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}
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else
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putchar (c);
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}
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}
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