nasm/nasmlib/filename.c

/* ----------------------------------------------------------------------- *
 *
 *   Copyright 1996-2017 The NASM Authors - All Rights Reserved
 *   See the file AUTHORS included with the NASM distribution for
 *   the specific copyright holders.
 *
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 *   modification, are permitted provided that the following
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 *
 *   * Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *   * Redistributions in binary form must reproduce the above
 *     copyright notice, this list of conditions and the following
 *     disclaimer in the documentation and/or other materials provided
 *     with the distribution.
 *
 *     THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
 *     CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
 *     INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 *     MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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 *     NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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 * ----------------------------------------------------------------------- */

/*
 * nasmlib.c	library routines for the Netwide Assembler
 */

#include "compiler.h"
#include "nasmlib.h"
#include "error.h"

/*
 * Add/modify a filename extension, assumed to be a period-delimited
 * field at the very end of the filename.  Returns a newly allocated
 * string buffer.
 */
const char *filename_set_extension(const char *inname, const char *extension)
{
    const char *q = inname;
    char *p;
    size_t elen = strlen(extension);
    size_t baselen;

    q = strrchrnul(inname, '.');   /* find extension or end of string */
    baselen = q - inname;

    p = nasm_malloc(baselen + elen + 1);

    memcpy(p, inname, baselen);
    memcpy(p+baselen, extension, elen+1);

    return p;
}