minix3/commands/cawf/macsup.c

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2020-02-21 00:59:27 +05:30
/*
* macsup.c - macro processing support functions for cawf(1)
*/
/*
* Copyright (c) 1991 Purdue University Research Foundation,
* West Lafayette, Indiana 47907. All rights reserved.
*
* Written by Victor A. Abell <abe@mace.cc.purdue.edu>, Purdue
* University Computing Center. Not derived from licensed software;
* derived from awf(1) by Henry Spencer of the University of Toronto.
*
* Permission is granted to anyone to use this software for any
* purpose on any computer system, and to alter it and redistribute
* it freely, subject to the following restrictions:
*
* 1. The author is not responsible for any consequences of use of
* this software, even if they arise from flaws in it.
*
* 2. The origin of this software must not be misrepresented, either
* by explicit claim or by omission. Credits must appear in the
* documentation.
*
* 3. Altered versions must be plainly marked as such, and must not
* be misrepresented as being the original software. Credits must
* appear in the documentation.
*
* 4. This notice may not be removed or altered.
*/
#include "cawf.h"
/*
* Delmacro(mx) - delete macro
*/
Delmacro(mx)
int mx; /* macro index */
{
unsigned char buf[MAXLINE]; /* error message buffer */
int i, j; /* temporary indexes */
if (mx >= Nmac) {
(void) sprintf((char *)buf, " bad Delmacro(%d) index", mx);
Error(FATAL, LINE, (char *)buf, NULL);
}
for (i = Macrotab[mx].bx, j = i + Macrotab[mx].ct; i < j; i++) {
Free(&Macrotxt[i]);
}
for (i = mx; i < (Nmac - 1); i++) {
Macrotab[i] = Macrotab[i+1];
}
Nmac--;
}
/*
* Field(n, p, c) - skip to field n in p and optionally return a copy
*/
unsigned char *
Field(n, p, c)
int n; /* field number */
unsigned char *p; /* pointer to line containing fields */
int c; /* 1: make a copy of the field */
{
unsigned char *fs, *fe, *s;
if (c)
Free(&F);
fe = p;
while (n) {
while (*fe == ' ' || *fe == '\t')
fe++;
fs = fe;
while (*fe && *fe != ' ' && *fe != '\t')
fe++;
if (fs == fe)
return(NULL);
if (n == 1) {
if ( ! c)
return(fs);
if ((F = (unsigned char *)malloc((size_t)(fe - fs + 1)))
== NULL)
Error(FATAL, LINE, " Field out of string space",
NULL);
(void) strncpy((char *)F, (char *)fs, (fe - fs));
F[fe -fs] = '\0';
return(F);
}
n--;
}
return(NULL);
}
/*
* Findmacro(p, e) - find macro and optionally enter it
*
* return = Macrotab[] index or -1 if not found
*/
Findmacro(p, e)
unsigned char *p; /* pointer to 2 character macro name */
int e; /* 0 = find, don't enter
* 1 = enter, don't find */
{
unsigned char c[3];
int cmp, hi, low, mid;
c[0] = p[0];
c[1] = (p[1] == ' ' || p[1] == '\t') ? '\0' : p[1];
c[2] = '\0';
low = mid = 0;
hi = Nmac - 1;
while (low <= hi) {
mid = (low + hi) / 2;
if ((cmp = strncmp((char *)c, (char *)Macrotab[mid].name, 2))
< 0)
hi = mid - 1;
else if (cmp > 0)
low = mid + 1;
else {
if ( ! e)
return(mid);
Error(WARN, LINE, " duplicate macro ", (char *)c);
hi = Macrotab[mid].bx + Macrotab[mid].ct;
for (low = Macrotab[mid].bx; low < hi; low++) {
Free(&Macrotxt[low]);
}
goto new_macro;
}
}
if ( ! e)
return(-1);
if (Nmac >= MAXMACRO)
Error(FATAL, LINE, " macro table full at ", (char *)c);
if (Nmac) {
if (cmp > 0)
mid++;
for (hi = Nmac - 1; hi >= mid; hi--)
Macrotab[hi+1] = Macrotab[hi];
}
Nmac++;
Macrotab[mid].name[0] = c[0];
Macrotab[mid].name[1] = c[1];
new_macro:
Macrotab[mid].bx = -1;
Macrotab[mid].ct = 0;
return(mid);
}
void
Free(p)
unsigned char **p;
{
if (*p != NULL) {
(void) free(*p);
*p = NULL;
}
}
/*
* Newstr(s) - allocate space for string
*/
unsigned char *
Newstr(s)
unsigned char *s;
{
unsigned char *ns;
if ((ns = (unsigned char *)malloc((size_t)(strlen((char *)s) + 1)))
== NULL)
Error(FATAL, LINE, " Newstr out of malloc space at ", (char *)s);
(void) strcpy((char *)ns, (char *)s);
return(ns);
}