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/***
File melt-make-string.c [making C constant strings from arguments]
Copyright (C) 2011, 2012 Free Software Foundation, Inc.
Indented with GNU indent.
This file is part of GCC.
GCC 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, or (at your option)
any later version.
GCC 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 GCC; see the file COPYING3. If not see
<http://www.gnu.org/licenses/>.
***/
/**
This is a self contained utility program. When given a list of pairs
as program argument, it outputs on stdout a sequence of C constant
strings. So, if invoked as:
melt-make-string foo abc bar bcd
it produces on stdout:
const char foo[]="abc";
const char bar[]="bcd";
However, it handles special characters correctly, e.g.
melt-make-string foo 'a"'
gives rightly, since the single quote is handled by the shell
const char foo[]="a\"";
and so on.
**/
#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
void output_cstr (const char *s);
/* output a C string with escapes when needed. */
void
output_cstr (const char *s)
{
char c;
for (s = s; (c = (*s)) != (char) 0; s++)
{
switch (c)
{
case '\n':
fputs ("\\n", stdout);
break;
case '\r':
fputs ("\\r", stdout);
break;
case '\t':
fputs ("\\t", stdout);
break;
case '\b':
fputs ("\\b", stdout);
break;
case '\v':
fputs ("\\v", stdout);
break;
case '\f':
fputs ("\\f", stdout);
break;
case '\\':
fputs ("\\\\", stdout);
break;
case '\'':
fputs ("\\\'", stdout);
break;
case '\"':
fputs ("\\\"", stdout);
break;
case '/':
case '*':
case '+':
case '-':
case '%':
case '$':
case ' ':
putc (c, stdout);
break;
default:
if (c < 0x7f && isprint (c))
putc (c, stdout);
else
printf ("\\%03o", (int) (c & 0xff));
break;
}
}
}
int
main (int argc, char **argv)
{
int ix = 0;
for (ix = 1; (ix + 1) < argc; ix += 2)
{
const char *name = argv[ix];
const char *str = argv[ix + 1];
const char *ps = NULL;
int badname = 0;
if (!name || !str)
break;
badname = !isalpha (name[0]);
for (ps = name; !badname && *ps; ps++)
if (isalnum (*ps) || *ps == '_')
continue;
else
badname = 1;
if (badname)
{
printf ("#error bad name %s\n", name);
fprintf (stderr, "bad name #%d: %s\n", ix, name);
exit (1);
}
puts ("#ifdef __cplusplus");
puts (" extern \"C\"");
puts ("#endif /*__cplusplus*/");
printf ("const char %s[]=\"", name);
output_cstr (str);
fputs ("\";\n", stdout);
}
if (fflush (stdout))
{
perror ("failed to flush stdout");
exit (1);
};
return 0;
}
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