--- /dev/null
+/* 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, 2001-2011 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 3 of the License, 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. If not, see <http://www.gnu.org/licenses/>. */
+
+
+#include <config.h>
+#include <stdio.h>
+#include <ctype.h>
+#include <setjmp.h>
+
+#ifdef STDC_HEADERS
+#include <float.h>
+#endif
+
+#include <unistd.h>
+
+#include "lisp.h"
+
+/* Since we use the macro CHAR_HEAD_P, we have to include this, but
+ don't have to include others because CHAR_HEAD_P does not contains
+ another macro. */
+#include "character.h"
+
+#ifndef DBL_MAX_10_EXP
+#define DBL_MAX_10_EXP 308 /* IEEE double */
+#endif
+
+/* Generate output from a format-spec FORMAT,
+ terminated at position FORMAT_END.
+ Output goes in BUFFER, which has room for BUFSIZE chars.
+ If the output does not fit, truncate it to fit.
+ Returns the number of bytes stored into BUFFER.
+ ARGS points to the vector of arguments, and NARGS says how many.
+ A double counts as two arguments.
+ String arguments are passed as C strings.
+ Integers are passed as C integers. */
+
+EMACS_INT
+doprnt (char *buffer, register int bufsize, const char *format,
+ const char *format_end, va_list ap)
+{
+ const char *fmt = format; /* Pointer into format string */
+ register char *bufptr = buffer; /* Pointer into output buffer.. */
+
+ /* Use this for sprintf unless we need something really big. */
+ char tembuf[DBL_MAX_10_EXP + 100];
+
+ /* Size of sprintf_buffer. */
+ unsigned size_allocated = sizeof (tembuf);
+
+ /* Buffer to use for sprintf. Either tembuf or same as BIG_BUFFER. */
+ char *sprintf_buffer = tembuf;
+
+ /* Buffer we have got with malloc. */
+ char *big_buffer = 0;
+
+ register int tem;
+ char *string;
+ char fixed_buffer[20]; /* Default buffer for small formatting. */
+ char *fmtcpy;
+ int minlen;
+ char charbuf[MAX_MULTIBYTE_LENGTH + 1]; /* Used for %c. */
+
+ if (format_end == 0)
+ format_end = format + strlen (format);
+
+ if ((format_end - format + 1) < sizeof (fixed_buffer))
+ fmtcpy = fixed_buffer;
+ else
+ fmtcpy = (char *) alloca (format_end - format + 1);
+
+ bufsize--;
+
+ /* Loop until end of format string or buffer full. */
+ while (fmt != format_end && bufsize > 0)
+ {
+ if (*fmt == '%') /* Check for a '%' character */
+ {
+ unsigned size_bound = 0;
+ EMACS_INT width; /* Columns occupied by STRING. */
+
+ fmt++;
+ /* Copy this one %-spec into fmtcpy. */
+ string = fmtcpy;
+ *string++ = '%';
+ while (1)
+ {
+ *string++ = *fmt;
+ if ('0' <= *fmt && *fmt <= '9')
+ {
+ /* Get an idea of how much space we might need.
+ This might be a field width or a precision; e.g.
+ %1.1000f and %1000.1f both might need 1000+ bytes.
+ Parse the width or precision, checking for overflow. */
+ unsigned n = *fmt - '0';
+ while ('0' <= fmt[1] && fmt[1] <= '9')
+ {
+ if (n * 10 + fmt[1] - '0' < n)
+ error ("Format width or precision too large");
+ n = n * 10 + fmt[1] - '0';
+ *string++ = *++fmt;
+ }
+
+ if (size_bound < n)
+ size_bound = n;
+ }
+ else if (*fmt == '-' || *fmt == ' ' || *fmt == '.' || *fmt == '+')
+ ;
+ else
+ break;
+ fmt++;
+ }
+ *string = 0;
+
+ /* Make the size bound large enough to handle floating point formats
+ with large numbers. */
+ if (size_bound + DBL_MAX_10_EXP + 50 < size_bound)
+ error ("Format width or precision too large");
+ size_bound += DBL_MAX_10_EXP + 50;
+
+ /* Make sure we have that much. */
+ if (size_bound > size_allocated)
+ {
+ if (big_buffer)
+ big_buffer = (char *) xrealloc (big_buffer, size_bound);
+ else
+ big_buffer = (char *) xmalloc (size_bound);
+ sprintf_buffer = big_buffer;
+ size_allocated = size_bound;
+ }
+ minlen = 0;
+ switch (*fmt++)
+ {
+ default:
+ error ("Invalid format operation %%%c", fmt[-1]);
+
+/* case 'b': */
+ case 'd':
+ case 'o':
+ case 'x':
+ if (sizeof (int) == sizeof (EMACS_INT))
+ ;
+ else if (sizeof (long) == sizeof (EMACS_INT))
+ /* Insert an `l' the right place. */
+ string[1] = string[0],
+ string[0] = string[-1],
+ string[-1] = 'l',
+ string++;
+ else
+ abort ();
+ sprintf (sprintf_buffer, fmtcpy, va_arg(ap, char *));
+ /* Now copy into final output, truncating as nec. */
+ string = sprintf_buffer;
+ goto doit;
+
+ case 'f':
+ case 'e':
+ case 'g':
+ {
+ double d = va_arg(ap, double);
+ sprintf (sprintf_buffer, fmtcpy, d);
+ /* Now copy into final output, truncating as nec. */
+ string = sprintf_buffer;
+ goto doit;
+ }
+
+ case 'S':
+ string[-1] = 's';
+ case 's':
+ if (fmtcpy[1] != 's')
+ minlen = atoi (&fmtcpy[1]);
+ string = va_arg (ap, char *);
+ tem = strlen (string);
+ width = strwidth (string, tem);
+ goto doit1;
+
+ /* Copy string into final output, truncating if no room. */
+ doit:
+ /* Coming here means STRING contains ASCII only. */
+ width = tem = strlen (string);
+ doit1:
+ /* We have already calculated:
+ TEM -- length of STRING,
+ WIDTH -- columns occupied by STRING when displayed, and
+ MINLEN -- minimum columns of the output. */
+ if (minlen > 0)
+ {
+ while (minlen > width && bufsize > 0)
+ {
+ *bufptr++ = ' ';
+ bufsize--;
+ minlen--;
+ }
+ minlen = 0;
+ }
+ if (tem > bufsize)
+ {
+ /* Truncate the string at character boundary. */
+ tem = bufsize;
+ while (!CHAR_HEAD_P (string[tem - 1])) tem--;
+ memcpy (bufptr, string, tem);
+ /* We must calculate WIDTH again. */
+ width = strwidth (bufptr, tem);
+ }
+ else
+ memcpy (bufptr, string, tem);
+ bufptr += tem;
+ bufsize -= tem;
+ if (minlen < 0)
+ {
+ while (minlen < - width && bufsize > 0)
+ {
+ *bufptr++ = ' ';
+ bufsize--;
+ minlen++;
+ }
+ minlen = 0;
+ }
+ continue;
+
+ case 'c':
+ {
+ /* Sometimes for %c we pass a char, which would widen
+ to int. Sometimes we pass XFASTINT() or XINT()
+ values, which would be EMACS_INT. Let's hope that
+ both are passed the same way, otherwise we'll need
+ to rewrite callers. */
+ EMACS_INT chr = va_arg(ap, EMACS_INT);
+ tem = CHAR_STRING ((int) chr, (unsigned char *) charbuf);
+ string = charbuf;
+ string[tem] = 0;
+ width = strwidth (string, tem);
+ if (fmtcpy[1] != 'c')
+ minlen = atoi (&fmtcpy[1]);
+ goto doit1;
+ }
+
+ case '%':
+ fmt--; /* Drop thru and this % will be treated as normal */
+ }
+ }
+
+ {
+ /* Just some character; Copy it if the whole multi-byte form
+ fit in the buffer. */
+ char *save_bufptr = bufptr;
+
+ do { *bufptr++ = *fmt++; }
+ while (--bufsize > 0 && !CHAR_HEAD_P (*fmt));
+ if (!CHAR_HEAD_P (*fmt))
+ {
+ bufptr = save_bufptr;
+ break;
+ }
+ }
+ };
+
+ /* If we had to malloc something, free it. */
+ xfree (big_buffer);
+
+ *bufptr = 0; /* Make sure our string end with a '\0' */
+ return bufptr - buffer;
+}
projects / emacs.git / commitdiff