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/*
* This software is copyrighted as noted below. It may be freely copied,
* modified, and redistributed, provided that the copyright notice is
* preserved on all copies.
*
* There is no warranty or other guarantee of fitness for this software,
* it is provided solely "as is". Bug reports or fixes may be sent
* to the author, who may or may not act on them as he desires.
*
* You may not include this software in a program or other software product
* without supplying the source, or without informing the end-user that the
* source is available for no extra charge.
*
* If you modify this software, you should include a notice giving the
* name of the person performing the modification, the date of modification,
* and the reason for such modification.
*/
/*
* rle_addhist.c - Add to the HISTORY comment in header
*
* Author: Andrew Marriott.
* School of Computer Science
* Curtin University of Technology
* Date: Mon Sept 10 1988
* Copyright (c) 1988, Curtin University of Technology
*/
#include <string.h>
#include <stdio.h>
#include <time.h>
#include "netpbm/mallocvar.h"
#include "rle.h"
static unsigned int
newCommentLen(const char * const histoire,
const char * const old,
const char ** const argv,
const char * const timedate,
const char * const padding) {
unsigned int length;
unsigned int i;
length = 0; /* initial value */
/* Add length of each arg plus space. */
for (i = 0; argv[i]; ++i) {
size_t const thisArgLen = strlen(argv[i]);
if (thisArgLen < UINT_MAX - length - 100) {
length += thisArgLen;
length += 1; /* For the space */
}
}
/* Add length of date and time in ASCII. */
length += strlen(timedate);
/* Add length of padding, "on ", and length of history name plus "="*/
length += strlen(padding) + 3 + strlen(histoire) + 1;
if (old && *old)
length += strlen(old); /* add length if there. */
++length; /* Add size of terminating NUL. */
return length;
}
void
rle_addhist(const char ** const argv,
rle_hdr * const inHdrP,
rle_hdr * const outHdrP) {
/*----------------------------------------------------------------------------
Put a history comment into the header struct.
Inputs:
argv: Command line history to add to comments.
*inHdrP: Incoming header struct to use.
Outputs:
*outHdrP: Outgoing header struct to add to.
Assumptions:
If no incoming struct then value is NULL.
Algorithm:
Calculate length of all comment strings, malloc and then set via
rle_putcom.
If we run out of memory, don't put the history comment in.
-----------------------------------------------------------------------------*/
if (!getenv("NO_ADD_RLE_HISTORY")) {
const char * const histoire = "HISTORY";
const char * const padding = "\t";
unsigned int length;
/* length of combined comment - the history comment we are adding
and any history comment that is already there (to which we
append)
*/
time_t nowTime;
/* padding must give number of characters in histoire */
/* plus one for "=" */
const char * timedate;
const char * old;
char * newc;
if (inHdrP) /* if we are interested in the old comments... */
old = rle_getcom(histoire, inHdrP); /* get old comment. */
else
old = NULL;
time(&nowTime);
timedate = ctime(&nowTime);
length = newCommentLen(histoire, old, argv, timedate, padding);
MALLOCARRAY(newc, length);
if (newc) {
unsigned int i;
strcpy(newc, histoire);
strcat(newc, "=");
if (old)
strcat(newc, old); /* add old string if there. */
for (i = 0; argv[i]; ++i) {
strcat(newc, argv[i]);
strcat(newc, " ");
}
strcat(newc, "on ");
strcat(newc, timedate); /* \n supplied by 'ctime'. */
strcat(newc, padding); /* to line up multiple histories.*/
rle_putcom(newc, outHdrP);
/* Creates reference to 'newc', may destroy reference to
previous comment memory, which will thereby leak.
*/
}
}
}
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