Move source into src directory

[a56.git] / src / subs.c

diff --git a/src/subs.c b/src/subs.c
new file mode 100644 (file)
index 0000000..5166717
--- /dev/null
+++ b/src/subs.c
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+/*******************************************************
+ *
+ *  a56 - a DSP56001 assembler
+ *
+ *  Written by Quinn C. Jensen
+ *  July 1990
+ *
+ *******************************************************\
+
+/*
+ * Copyright (C) 2008 Robert Millan <rmh@aybabtu.com>
+ * Copyright (C) 2012 Thorsten Alteholz <debian@alteholz.de>
+ *
+ * This file 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 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, see
+ * <http://www.gnu.org/licenses/>.
+ *
+ * This file incorporates work covered by the following copyright and
+ * permission notice:
+ *
+ * Copyright (C) 1990-1994 Quinn C. Jensen
+ *
+ * Permission to use, copy, modify, distribute, and sell this software
+ * and its documentation for any purpose is hereby granted without fee,
+ * provided that the above copyright notice appear in all copies and
+ * that both that copyright notice and this permission notice appear
+ * in supporting documentation.  The author makes no representations
+ * about the suitability of this software for any purpose.  It is
+ * provided "as is" without express or implied warranty.
+ *
+ */
+static char *Copyright = "Copyright (C) 1990-1994 Quinn C. Jensen";
+
+/*
+ *  subs.c - Some subroutines for the assembler.
+ *
+ */
+
+#include "a56.h"
+
+#define MAX 1024
+
+FILE *open_read(file)
+char *file;
+{
+       FILE *fp;
+
+       if(strcmp(file, "-") == 0)
+               fp = stdin;
+       else if ((fp = fopen(file, "r")) == NULL) {
+               perror(file);
+               exit(1);
+       }       
+       return fp;
+}
+
+FILE *open_write(file)
+char *file;
+{
+       FILE *fp;
+       if ((fp = fopen(file, "w")) == NULL) {
+               perror(file);
+               exit(1);
+       }       
+       return fp;
+}
+
+FILE *open_append(file)
+char *file;
+{
+       FILE *fp;
+       if ((fp = fopen(file, "a")) == NULL) {
+               perror(file);
+               exit(1);
+       }       
+       return fp;
+}
+
+fatal(c, a1, a2, a3, a4, a5, a6, a7, a8)
+char *c, *a1, *a2, *a3, *a4, *a5, *a6, *a7, *a8;
+{
+       fprintf(stderr, c, a1, a2, a3, a4, a5, a6, a7, a8);
+       exit(1);
+}
+
+#define TABS 8
+#define MAX_BUF 256
+
+char tabbuf[MAX_BUF], *untabn();
+char *untab(s) /* expand tabs in s */
+register char *s;
+{
+       return untabn(s, TABS);
+}
+
+char *untabn(s, stops) /* expand tabs in s */
+register char *s;
+register int stops;
+{
+       char *o = s;
+
+       /* copy input string into buffer to scan while input string is modified */
+
+       register char *b = tabbuf;
+       
+       strncpy(b, s, MAX_BUF);
+
+       /* iterate until the copy of the input string is depleted */
+
+       while(*b) {
+               if(*b == '\t') {
+                       do
+                               *s = ' ';
+                       while ((++s - o) % stops);
+               } else {
+                       *s = *b; s++;
+               }
+               b++;
+       }
+
+       /* null terminate the resultant string */
+
+       *s = '\0';
+
+       return o;
+}
+
+char *alloc(size)
+int size;
+{
+       char *p = (char *)malloc(size);
+       if(NOT p)
+               fatal("alloc:  insufficient virtual memory to allocate %d bytes\n", 
+                       size);
+       return p;
+}
+
+#define ascii2n(c)  \
+       ((c) >= 'a' ? (c) - 'a' + 10 : ((c) >= 'A' ? (c) - 'A' + 10 : (c) - '0'))
+
+#define valid(c) ((c) >= '0' && (c) <= '9' || \
+       (c) >= 'A' && (c) <= 'Z' || \
+       (c) >= 'a' && (c) <= 'z')
+
+a56_strtol(s, p, base)
+register char *s, **p;
+register int base;
+{
+       register long result = 0;
+       register int sign = 0;
+
+       while(*s == ' ' || *s == '\t')
+               s++;
+
+       if(*s == '-') {
+               s++;
+               sign++;
+       }
+
+       while(valid(*s)) {
+               register int dig = ascii2n(*s);
+               if(dig >= base)
+                       break;
+               result *= base;
+               result += dig;
+               s++;
+       }
+
+       if(p)
+               *p = s;
+
+       return sign ? -result : result;
+}