echo.c
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/* GNU Mailutils -- a suite of utilities for electronic mail
Copyright (C) 1999, 2001, 2002, 2007, 2010 Free Software Foundation,
Inc.
GNU Mailutils 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.
GNU Mailutils 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 GNU Mailutils. If not, see <http://www.gnu.org/licenses/>. */
#include "mail.h"
/*
* ec[ho] string ...
*/
static int echo (char *s);
int
mail_echo (int argc, char **argv)
{
int i = 0;
if (argc > 1)
{
for (i = 1; i < argc - 1; i++)
{
echo (argv[i]);
fputc (' ', ofile);
}
/* Last argument. */
if (echo(argv[argc - 1]) == 0)
fputc ('\n', ofile);
}
return 0;
}
/* Cumbersome switch for checking escape char '\'
if present replace with appropriately.
Return of 1 means to not print newline. */
static int
echo (char *s)
{
int process_escape = 0;
int c;
if (s == NULL)
return 0;
for (; (c = *s) != 0; s++)
{
if (process_escape)
{
switch (c)
{
/* \a Bell. */
case 'a':
c = '\a';
break;
/* \b Backspace. */
case 'b':
c = '\b';
break;
/* \c means not to print ending newline. */
/* Bail out and tell the caller not to print newline. */
case 'c':
return 1;
break;
/* \f Formfeed. */
case 'f':
c = '\f';
break;
/* \n Newline. */
case 'n':
c = '\n';
break;
/* \r Carriage return. */
case 'r':
c = '\r';
break;
/* \t Tab. */
case 't':
c = '\t';
break;
/* \v Vertical Tab. */
case 'v':
c = '\v';
break;
/* Escape sequence. */
case '\\':
c = '\\';
break;
/* \0x99 for example, let strtol() handle it. */
/* WARNING: Side effects because of strtol(). */
case '0':
{
long number = strtol (s, &s, 0);
switch (number)
{
case LONG_MIN:
case LONG_MAX:
/* if (errno == ERANGE) */
/* fputc (c, ofile); */
break;
default:
fprintf (ofile, "%ld", number);
s--;
continue;
}
}
break;
/* Can not be here. */
case '\0':
return 0;
break;
/* \\ means \ It was not an escape char. */
default:
fputc ('\\', ofile);
}
process_escape =0;
}
else if (c == '\\') /* Find the escape char, go back and process. */
{
process_escape = 1;
continue;
}
fputc (c, ofile);
}
return 0;
}