From 346b0368cf4a14587881e37ae3d8295417922eaf Mon Sep 17 00:00:00 2001
From: Jim Meyering <jim@meyering.net>
Date: Mon, 29 Apr 1996 01:43:52 +0000
Subject: .

---
 src/asa.c | 277 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 277 insertions(+)
 create mode 100644 src/asa.c

(limited to 'src/asa.c')

diff --git a/src/asa.c b/src/asa.c
new file mode 100644
index 000000000..64260f88f
--- /dev/null
+++ b/src/asa.c
@@ -0,0 +1,277 @@
+/* 
+ *  asa.c - interpret ASA carriage control characters
+ *  Copyright (C) 1994 Thomas Koenig
+ *
+ *  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., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#define _POSIX_SOURCE 1
+
+/* System Headers */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+
+/* Macros */
+
+#define LINESIZE 135
+#define NUMLINES 5
+#define MAX(a,b) ((a) > (b) ? (a) : (b))
+
+/* Structures and unions */
+
+typedef struct
+{
+    char *chr;
+    size_t len;
+} str;
+
+/* File scope variables */
+
+static char rcsid[] = "$Id: asa.c,v 1.1 1996/04/29 01:43:52 meyering Exp $";
+static str *line_buffer = (str *) 0;
+static size_t line_num = 0;
+static size_t linebuf_size;
+
+/* Function declarations */
+
+static void *mymalloc(size_t);
+static size_t readline(FILE *fp, char **a);
+static void form_feed(void);
+static void add_line(str);
+static void flush(void);
+static void copy_file(FILE *fp);
+  
+/* Local functions */
+
+static void*
+mymalloc(size_t n)
+{
+    void *p;
+    if ((p=malloc(n)))
+	return p;
+    else
+    {
+	fprintf(stderr,"Virtual memory exhausted\n");
+	exit(EXIT_FAILURE);
+    }
+}
+
+static void*
+myrealloc(void *p, size_t n)
+{
+    if ((p=realloc(p,n)))
+	return p;
+    else
+    {
+	fprintf(stderr,"Virtual memory exhausted\n");
+	exit(EXIT_FAILURE);
+    }
+}
+static void
+form_feed()
+{
+    putchar('\f');
+}
+
+static void
+new_line()
+{
+    putchar('\n');
+}
+
+static void
+add_line(str a)
+{
+    if (line_num >= linebuf_size)
+    {
+	linebuf_size += NUMLINES;
+	line_buffer = myrealloc(line_buffer, linebuf_size*sizeof(str *));
+    }
+    line_buffer[line_num]=a;
+    line_num++;
+}
+
+static void
+flush()
+{
+    size_t i,j;
+    size_t max_len;
+
+    if (line_num == 0)
+	return;
+    if (line_num == 1)
+    {
+	printf("%s\n", line_buffer[0].chr +1);
+	line_num = 0;
+	return;
+    }
+    max_len = 0;
+    for (j=0; j< line_num; j++)
+	max_len = MAX(max_len, line_buffer[j].len);
+
+    for (i=1; i<= max_len;  i++)
+    {
+	int printed = 0;
+
+	for (j=0; j< line_num; j++)
+	{
+	    if (line_buffer[j].len > i)
+	    {
+		int ch = line_buffer[j].chr[i];
+
+		if (ch != ' ') {
+	            if (printed)
+			putchar('\b');
+		    putchar(ch);
+		    printed = 1;
+		}
+	    }
+	}
+	if (!printed)
+	    putchar(' ');
+    }
+    for (j=0; j<line_num; j++)
+	free(line_buffer[j].chr);
+
+    line_num = 0;
+    putchar('\n');
+}
+
+static size_t
+readline(FILE *fp, char **ret)
+{
+    static char *buffer=(char *) 0;
+    char *ret_buff;
+    static int bufsize = LINESIZE;
+    int ch;
+    size_t len=0;
+    int inc;
+    int i;
+
+    if (buffer == (char*) 0)
+	buffer = (char *) mymalloc(LINESIZE);
+
+    while(1)
+    {
+        ch = fgetc(fp);
+	if (ch == EOF)
+	    break;
+	if (ch == '\t')
+	{
+	    ch = ' ';
+	    inc = 8 - (len % 8);
+	}
+	else
+	    inc = 1;
+
+	if (len + inc > bufsize-2)
+	{
+	    bufsize += LINESIZE;
+	    buffer = myrealloc(buffer, bufsize);
+	}
+	for (i=0; i<inc; i++)
+	    buffer[len+i] = ch;
+	len += inc;
+	if (ch == '\n')
+	    break;
+    }
+    buffer[len]='\0';
+    ret_buff = mymalloc(len+1);
+    strcpy(ret_buff, buffer);
+    *ret = ret_buff;
+    return len;
+}
+
+static void
+copy_file(FILE *fp)
+{
+    str line;
+    static first_line = 1;
+
+    while ((line.len=readline(fp, &(line.chr))))
+    {
+	if (line.chr[line.len-1] == '\n')
+	{
+	   line.chr[line.len-1] = '\0';
+	   line.len--;
+	}
+
+	switch (line.chr[0])
+	{
+	case '+':
+	    add_line(line);
+	    break;
+
+	case '0':
+	    flush();
+	    new_line();
+	    add_line(line);
+	    break;
+
+	case '1':
+	    flush();
+	    if (! first_line)
+		form_feed();
+	    add_line(line);
+	    break;
+
+	case ' ':
+	    flush();
+	    add_line(line);
+	    break;
+
+	default:
+	    flush();
+	    add_line(line);
+	    break;
+	}
+        first_line = 0;
+    }
+}
+
+/* Global functions */
+
+int
+main(int argc, char **argv)
+{
+
+    line_buffer = (str *) mymalloc(NUMLINES*sizeof(str*));
+    linebuf_size = NUMLINES;
+
+    if (argc == 1)
+	copy_file(stdin);
+    else
+    {
+	FILE *fp;
+	char *fname;
+
+	while(--argc > 0)
+	{
+	    fname = *++argv;
+	    if ((fp = fopen(fname,"r")) == NULL)
+	    {
+		fprintf(stderr,"Cannot open %s: %s\n",fname,strerror(errno));
+		exit(EXIT_FAILURE);
+	    }
+	    copy_file(fp);
+	    fclose(fp);
+	}
+    }
+    flush();
+    exit(EXIT_SUCCESS);
+}
-- 
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