date and time created 90/01/02 16:27:49 by bostic

SCCS-vsn: usr.bin/fpr/fpr.c 5.1

diff --git a/usr/src/usr.bin/fpr/fpr.c b/usr/src/usr.bin/fpr/fpr.c
new file mode 100644 (file)
index 0000000..e60948b
--- /dev/null
+++ b/usr/src/usr.bin/fpr/fpr.c
@@ -0,0 +1,365 @@
+
+#include <stdio.h>
+
+#define BLANK ' '
+#define TAB '\t'
+#define NUL '\000'
+#define FF '\f'
+#define BS '\b'
+#define CR '\r'
+#define VTAB '\013'
+#define EOL '\n'
+
+#define TRUE 1
+#define FALSE 0
+
+#define MAXCOL 170
+#define TABSIZE 8
+#define INITWIDTH 8
+
+typedef
+  struct column
+    {
+      int count;
+      int width;
+      char *str;
+    }
+  COLUMN;
+
+char cc;
+char saved;
+int length;
+char *text;
+int highcol;
+COLUMN *line;
+int maxpos;
+int maxcol;
+
+extern char *malloc();
+extern char *calloc();
+extern char *realloc();
+
+\f
+
+main()
+{
+  register int ch;
+  register char ateof;
+  register int i;
+  register int errorcount;
+
+
+  init();
+  errorcount = 0;
+  ateof = FALSE;
+
+  ch = getchar();
+  if (ch == EOF)
+    exit(0);
+
+  if (ch == EOL)
+    {
+      cc = NUL;
+      ungetc((int) EOL, stdin);
+    }
+  else if (ch == BLANK)
+    cc = NUL;
+  else if (ch == '1')
+    cc = FF;
+  else if (ch == '0')
+    cc = EOL;
+  else if (ch == '+')
+    cc = CR;
+  else
+    {
+      errorcount = 1;
+      cc = NUL;
+      ungetc(ch, stdin);
+    }
+
+  while ( ! ateof)
+    {
+      gettext();
+      ch = getchar();
+      if (ch == EOF)
+       {
+         flush();
+         ateof = TRUE;
+       }
+      else if (ch == EOL)
+       {
+         flush();
+         cc = NUL;
+         ungetc((int) EOL, stdin);
+       }
+      else if (ch == BLANK)
+       {
+         flush();
+         cc = NUL;
+       }
+      else if (ch == '1')
+       {
+         flush();
+         cc = FF;
+       }
+      else if (ch == '0')
+       {
+         flush();
+         cc = EOL;
+       }
+      else if (ch == '+')
+       {
+         for (i = 0; i < length; i++)
+           savech(i);
+       }
+      else
+       {
+         errorcount++;
+         flush();
+         cc = NUL;
+         ungetc(ch, stdin);
+       }
+    }
+
+  if (errorcount == 1)
+    fprintf(stderr, "Illegal carriage control - 1 line.\n");
+  else if (errorcount > 1)
+    fprintf(stderr, "Illegal carriage control - %d lines.\n", errorcount);
+
+  exit(0);
+}
+
+\f
+
+init()
+{
+  register COLUMN *cp;
+  register COLUMN *cend;
+  register char *sp;
+
+
+  length = 0;
+  maxpos = MAXCOL;
+  sp = malloc((unsigned) maxpos);
+  if (sp == NULL)
+    nospace();
+  text = sp;
+
+  highcol = -1;
+  maxcol = MAXCOL;
+  line = (COLUMN *) calloc(maxcol, (unsigned) sizeof(COLUMN));
+  if (line == NULL)
+    nospace();
+  cp = line;
+  cend = line + (maxcol-1);
+  while (cp <= cend)
+    {
+      cp->width = INITWIDTH;
+      sp = calloc(INITWIDTH, (unsigned) sizeof(char));
+      if (sp == NULL)
+       nospace();
+      cp->str = sp;
+      cp++;
+    }
+}
+
+\f
+
+gettext()
+{
+  register int i;
+  register char ateol;
+  register int ch;
+  register int pos;
+
+
+  i = 0;
+  ateol = FALSE;
+
+  while ( ! ateol)
+    {
+      ch = getchar();
+      if (ch == EOL || ch == EOF)
+       ateol = TRUE;
+      else if (ch == TAB)
+       {
+         pos = (1 + i/TABSIZE) * TABSIZE;
+         if (pos > maxpos)
+           {
+             maxpos = pos + 10;
+             text = realloc(text, (unsigned) maxpos);
+             if (text == NULL)
+               nospace();
+           }
+         while (i < pos)
+           {
+             text[i] = BLANK;
+             i++;
+           }
+       }
+      else if (ch == BS)
+       {
+         if (i > 0)
+           {
+             i--;
+             savech(i);
+           }
+       }
+      else if (ch == CR)
+       {
+         while (i > 0)
+           {
+             i--;
+             savech(i);
+           }
+       }
+      else if (ch == FF || ch == VTAB)
+       {
+         flush();
+         cc = ch;
+         i = 0;
+       }
+      else
+       {
+         if (i >= maxpos)
+           {
+             maxpos = i + 10;
+             text = realloc(text, (unsigned) maxpos);
+             if (text == NULL)
+               nospace();
+           }
+         text[i] = ch;
+         i++;
+       }
+    }
+
+  length = i;
+}
+
+\f
+
+savech(col)
+int col;
+{
+  register char ch;
+  register int oldmax;
+  register COLUMN *cp;
+  register COLUMN *cend;
+  register char *sp;
+  register int newcount;
+
+
+  ch = text[col];
+  if (ch == BLANK)
+    return;
+
+  saved = TRUE;
+
+  if (col >= highcol)
+    highcol = col;
+
+  if (col >= maxcol)
+    {
+      oldmax = maxcol;
+      maxcol = col + 10;
+      line = (COLUMN *) realloc(line, (unsigned) maxcol*sizeof(COLUMN));
+      if (line == NULL)
+       nospace();
+      cp = line + oldmax;
+      cend = line + (maxcol - 1);
+      while (cp <= cend)
+       {
+         cp->width = INITWIDTH;
+         cp->count = 0;
+         sp = calloc(INITWIDTH, (unsigned) sizeof(char));
+         if (sp == NULL)
+           nospace();
+         cp->str = sp;
+         cp++;
+       }
+    }
+
+  cp = line + col;
+  newcount = cp->count + 1;
+  if (newcount > cp->width)
+    {
+      cp->width = newcount;
+      sp = realloc(cp->str, (unsigned) newcount*sizeof(char));
+      if (sp == NULL)
+       nospace();
+      cp->str = sp;
+    }
+  cp->count = newcount;
+  cp->str[newcount-1] = ch;
+}
+
+\f
+
+flush()
+{
+  register int i;
+  register int anchor;
+  register int height;
+  register int j;
+
+
+  if (cc != NUL)
+    putchar(cc);
+
+  if ( ! saved)
+    {
+      i = length;
+      while (i > 0 && text[i-1] == BLANK)
+       i--;
+      length == i;
+      for (i = 0; i < length; i++)
+       putchar(text[i]);
+      putchar(EOL);
+      return;
+    }
+
+  for (i =0; i < length; i++)
+    savech(i);
+
+  anchor = 0;
+  while (anchor <= highcol)
+    {
+      height = line[anchor].count;
+      if (height == 0)
+       {
+         putchar(BLANK);
+         anchor++;
+       }
+      else if (height == 1)
+       {
+         putchar( *(line[anchor].str) );
+         line[anchor].count = 0;
+         anchor++;
+       }
+      else
+       {
+         i = anchor;
+         while (i < highcol && line[i+1].count > 1)
+           i++;
+         for (j = anchor; j <= i; j++)
+           {
+             height = line[j].count - 1;
+             putchar(line[j].str[height]);
+             line[j].count = height;
+           }
+         for (j = anchor; j <= i; j++)
+           putchar(BS);
+       }
+    }
+
+  putchar(EOL);
+  highcol = -1;
+}
+
+\f
+
+nospace()
+{
+  fputs("Storage limit exceeded.\n", stderr);
+  exit(1);
+}