123 lines
3.3 KiB
C
123 lines
3.3 KiB
C
/*-
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* Copyright (c) 1998 John D. Polstra
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#ifdef __FBSDID
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__FBSDID("$FreeBSD$");
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#endif
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#include <sys/param.h>
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#include <objformat.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#define PATH_OBJFORMAT "/etc/objformat"
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static int copyformat(char *, const char *, size_t);
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static const char *known_formats[] = { OBJFORMAT_NAMES, NULL };
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static int
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copyformat(char *buf, const char *fmt, size_t bufsize)
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{
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size_t len;
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len = strlen(fmt);
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if (len > bufsize - 1)
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return -1;
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strcpy(buf, fmt);
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return len;
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}
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int
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getobjformat(char *buf, size_t bufsize, int *argcp, char **argv)
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{
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const char *fmt;
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char **src, **dst;
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const char *env;
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FILE *fp;
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fmt = NULL;
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if (argv != NULL) {
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/*
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* Scan for arguments setting known formats, e.g., "-elf".
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* If "argcp" is non-NULL, delete these arguments from the
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* list and update the argument count in "*argcp".
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*/
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for (dst = src = argv; *src != NULL; src++) {
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if ((*src)[0] == '-') {
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const char **p;
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for (p = known_formats; *p != NULL; p++)
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if (strcmp(*src + 1, *p) == 0)
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break;
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if (*p != NULL) {
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fmt = *p;
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if (argcp == NULL) /* Don't delete */
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*dst++ = *src;
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} else
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*dst++ = *src;
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} else
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*dst++ = *src;
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}
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*dst = NULL;
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if (argcp != NULL)
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*argcp -= src - dst;
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if (fmt != NULL)
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return copyformat(buf, fmt, bufsize);
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}
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/* Check the OBJFORMAT environment variable. */
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if ((env = getenv("OBJFORMAT")) != NULL)
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return copyformat(buf, env, bufsize);
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/* Take a look at "/etc/objformat". */
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if ((fp = fopen(PATH_OBJFORMAT, "r")) != NULL) {
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char line[1024];
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int found;
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int len;
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found = len = 0;
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while (fgets(line, sizeof line, fp) != NULL) {
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if (strncmp(line, "OBJFORMAT=", 10) == 0) {
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char *p = &line[10];
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p[strcspn(p, " \t\n")] = '\0';
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len = copyformat(buf, p, bufsize);
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found = 1;
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}
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}
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fclose(fp);
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if (found)
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return len;
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}
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/* As a last resort, use the compiled in default. */
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return copyformat(buf, OBJFORMAT_DEFAULT, bufsize);
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}
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