Initial revision

src/doprnt.c

+/* Output like sprintf to a buffer of specified size.
+   Also takes args differently: pass one pointer to an array of strings
+   in addition to the format string which is separate.
+   Copyright (C) 1985 Free Software Foundation, Inc.
+
+This file is part of GNU Emacs.
+
+GNU Emacs 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 1, or (at your option)
+any later version.
+
+GNU Emacs 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 GNU Emacs; see the file COPYING.  If not, write to
+the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
+
+
+#include <stdio.h>
+#include <ctype.h>
+
+doprnt (buffer, bufsize, format, format_end, nargs, args)
+     char *buffer;
+     register int bufsize;
+     char *format;
+     char *format_end;
+     int nargs;
+     char **args;
+{
+  int cnt = 0;			/* Number of arg to gobble next */
+  register char *fmt = format;	/* Pointer into format string */
+  register char *bufptr = buffer; /* Pointer into output buffer.. */
+  char tembuf[512];
+  register int tem;
+  char *string;
+  char fmtcpy[20];
+  int minlen;
+  int size;			/* Field width factor; e.g., %90d */
+
+  if (format_end == 0)
+    format_end = format + strlen (format);
+
+  bufsize--;
+  while (fmt != format_end && bufsize > 0)	/* Loop until end of format string or buffer full */
+    {
+      if (*fmt == '%')	/* Check for a '%' character */
+	{
+	  fmt++;
+	  /* Copy this one %-spec into fmtcopy.  */
+	  string = fmtcpy;
+	  *string++ = '%';
+	  while (1)
+	    {
+	      *string++ = *fmt;
+	      if (! (*fmt >= '0' && *fmt <= '9') && *fmt != '-' && *fmt != ' ')
+		break;
+	      fmt++;
+	    }
+	  *string = 0;
+	  minlen = 0;
+	  switch (*fmt++)
+	    {
+	    default:
+	      error ("Invalid format operation %%%c", fmt[-1]);
+
+/*	    case 'b': */
+	    case 'd':
+	    case 'o':
+	    case 'x':
+	      if (cnt == nargs)
+		error ("Format string wants too many arguments");
+	      sprintf (tembuf, fmtcpy, args[cnt++]);
+	      /* Now copy tembuf into final output, truncating as nec.  */
+	      string = tembuf;
+	      goto doit;
+
+	    case 'S':
+	      string[-1] = 's';
+	    case 's':
+	      if (cnt == nargs)
+		error ("Format string wants too many arguments");
+	      string = args[cnt++];
+	      if (fmtcpy[1] != 's')
+		minlen = atoi (&fmtcpy[1]);
+	      /* Copy string into final output, truncating if no room.  */
+	    doit:
+	      tem = strlen (string);
+	      if (minlen > 0)
+		{
+		  while (minlen > tem && bufsize > 0)
+		    {
+		      *bufptr++ = ' ';
+		      bufsize--;
+		      minlen--;
+		    }
+		  minlen = 0;
+		}
+	      if (tem > bufsize)
+		tem = bufsize;
+	      strncpy (bufptr, string, tem);
+	      bufptr += tem;
+	      bufsize -= tem;
+	      if (minlen < 0)
+		{
+		  while (minlen < - tem && bufsize > 0)
+		    {
+		      *bufptr++ = ' ';
+		      bufsize--;
+		      minlen++;
+		    }
+		  minlen = 0;
+		}
+	      continue;
+
+	    case 'c':
+	      if (cnt == nargs)
+		error ("Format string wants too many arguments");
+	      *bufptr++ = (int) args[cnt++];
+	      bufsize--;
+	      continue;
+
+	    case '%':
+	      fmt--;    /* Drop thru and this % will be treated as normal */
+	    }
+	}
+      *bufptr++ = *fmt++;	/* Just some characters; Copy 'em */
+      bufsize--;
+    };
+
+  *bufptr = 0;		/* Make sure our string end with a '\0' */
+  return bufptr - buffer;
+}