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/*
utils.c -- utilities for interactive editor of prerequisite-chart descriptions
Copyright (C) 2005 - 2014 R. D. Tennent
School of Computing, Queen's University, rdt@cs.queensu.ca
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 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, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
# include "prerex.h"
void
error (char msg[]) /* abort with stderr message msg */
{
fprintf (stderr, "Error: %s\n", msg);
# ifdef HAVE_LIBEDIT
history_end (hist);
el_end (el);
# endif
close_files ();
exit (EXIT_FAILURE);
}
size_t
append (char *dst, char **offset, const char *src, size_t n)
/* Copies src to *offset and updates *offset accordingly (if possible).
* Assumes *offset is dst if offset == NULL.
* Execution aborts if **offset != '\0'. The src string must be null-terminated.
* Returns (original offset - dst) + strlen(src); if >= n, the string was truncated.
*/
{
const char *s = src;
char *d;
char *off_orig = ( offset != NULL ? *offset : dst );
d = off_orig;
if (*d != '\0')
{
char msg[LINE_LEN + 24] = {'\0'};
char *msg_n = msg;
append (msg, &msg_n, "\nNull character expected at offset specified for string ", sizeof (msg));
append (msg, &msg_n, src, sizeof (msg));
error (msg);
}
n = n - 1 - (off_orig - dst); /* number of available slots (leaving room for \0) */
while (n > 0 && *s != '\0')
{
*d = *s; /* copy non-null character */
d++; s++; n--;
}
*d = '\0'; /* null-terminate */
if (offset != NULL)
*offset = d; /* update *offset (if possible) */
while (*s != '\0') /* traverse rest of src */
s++;
return (off_orig - dst) + (s - src); /* length of the untruncated string */
}
bool
prefix (const char *cs, const char *ct)
/* is string cs[] a prefix of ct[]? */
{
const char *pcs = cs;
const char *pct = ct;
while (*pcs != '\0')
{
if (*pcs != *pct) return false;
pcs++; pct++;
}
return true;
}
bool
suffix (const char *cs, const char *ct)
/* is string cs[] a suffix of ct[]? */
{
const char *pcs = cs;
const char *pct = ct + strlen (ct) - strlen (cs);
while (*pcs != '\0')
{
if (*pct != *pcs) return false;
pcs++; pct++;
}
return true;
}
void
copy (FILE * f, FILE * g)
{
int c;
fflush (f);
rewind (f);
c = getc (f);
while (c != EOF)
{
putc (c, g);
c = getc (f);
}
}
bool
inrange (coord x, coord x0, coord x1)
/* is coordinate x in the range x0:x1? */
{
# define min(x,y) (x < y ? x : y)
# define max(x,y) (x < y ? y : x)
return x >= min(x0, x1) && x <= max(x0, x1) ;
}
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