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335 lines
8.0 KiB
C
335 lines
8.0 KiB
C
#define UTIL__C
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/* Some generally useful routines */
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/* The majority of the non-portable code is in here. */
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/*
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Copyright (c) 2001, Richard Krehbiel
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All rights reserved.
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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 are
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met:
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o 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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o 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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o Neither the name of the copyright holder nor the names of its
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contributors may be used to endorse or promote products derived from
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this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
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TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
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USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
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DAMAGE.
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*/
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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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#include <ctype.h>
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#include "util.h" /* own defintions */
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#ifdef WIN32
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#include <sys/types.h>
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#include <sys/stat.h>
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#define stat _stat
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#else
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#include <sys/stat.h>
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#include <unistd.h>
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#endif
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static void my_searchenv1(
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char *name,
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char *envname,
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char *hitfile,
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int hitlen);
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static void my_searchenv2(
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char *name,
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char *envname,
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char *hitfile,
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int hitlen);
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/* Sure, the library typically provides some kind of
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ultoa or _ultoa function. But since it's merely typical
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and not standard, and since the function is so simple,
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I'll write my own.
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It's significant feature is that it'll produce representations in
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any number base from 2 to 36.
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*/
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char *my_ultoa(
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unsigned long val,
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char *buf,
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unsigned int base)
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{
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static char digits[] = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
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char *strt = buf,
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*end;
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do {
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*buf++ = digits[val % base];
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val /= base;
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} while (val != 0);
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*buf = 0; /* delimit */
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end = buf + 1;
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/* Now reverse the bytes */
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while (buf > strt) {
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char temp;
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temp = *--buf;
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*buf = *strt;
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*strt++ = temp;
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}
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return end;
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}
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/* Ditto my_ultoa. This actually emits
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a signed representation in other number bases. */
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char *my_ltoa(
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long val,
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char *buf,
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unsigned int base)
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{
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unsigned long uval;
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if (val < 0)
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uval = -val, *buf++ = '-';
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else
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uval = val;
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return my_ultoa(uval, buf, base);
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}
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/*
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_searchenv is a function provided by the MSVC library that finds
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files which may be anywhere along a path which appears in an
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environment variable. I duplicate that function for portability.
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Note also that mine avoids destination buffer overruns.
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Added functionality to lowercase the file name and to remove the
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device name and directory.
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*/
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void my_searchenv(
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char *name,
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char *envname,
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char *hitfile,
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int hitlen)
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{
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my_searchenv1(name, envname, hitfile, hitlen);
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if (*hitfile) {
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return;
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}
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char *copy = memcheck(strdup(name));
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downcase(copy);
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my_searchenv1(copy, envname, hitfile, hitlen);
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free(copy);
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}
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static void my_searchenv1(
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char *name,
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char *envname,
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char *hitfile,
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int hitlen)
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{
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my_searchenv2(name, envname, hitfile, hitlen);
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if (*hitfile) {
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return;
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}
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/*
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* Parse DEV:[DIR]NAME
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* while re-trying the search after DEV: and after [DIR].
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*
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* Let's not be too critical about the characters we allow in those.
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*/
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char *p = name;
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char c;
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while ((c = *p++)) {
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if (c == ':') {
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my_searchenv2(p, envname, hitfile, hitlen);
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if (*hitfile) {
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return;
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}
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}
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if (c == '[') {
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char *enddir = strchr(p, ']');
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if (enddir == NULL) {
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return; /* weird syntax */
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}
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p = enddir + 1;
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my_searchenv2(p, envname, hitfile, hitlen);
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return;
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}
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}
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return;
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}
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static void my_searchenv2(
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char *name,
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char *envname,
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char *hitfile,
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int hitlen)
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{
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char *env;
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char *envcopy;
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char *envcopy2;
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char *cp;
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char *last;
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*hitfile = 0; /* Default failure indication */
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/* Note: If the given name is absolute, then don't search the
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path, but use it as is. */
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if (
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#ifdef WIN32
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strchr(name, ':') != NULL || /* Contain a drive spec? */
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name[0] == '\\' || /* Start with absolute ref? */
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#endif
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name[0] == '/') { /* Start with absolute ref? */
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strncpy(hitfile, name, hitlen); /* Copy to target */
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return;
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}
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env = getenv(envname);
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if (env == NULL) { /* If not defined, search in */
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env = "."; /* current directory */
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}
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envcopy = strdup(env); /* strtok destroys its text
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argument. I don't want the return
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value from getenv destroyed. */
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envcopy2 = envcopy;
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while ((cp = strtok_r(envcopy2, PATHSEP, &last)) != NULL) {
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struct stat info;
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char *concat = malloc(strlen(cp) + strlen(name) + 2);
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if (concat == NULL) {
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free(envcopy);
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return;
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}
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strcpy(concat, cp);
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if (concat[strlen(concat) - 1] != '/')
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strcat(concat, "/");
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strcat(concat, name);
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if (!stat(concat, &info)) {
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/* Copy the file name to hitfile. Assure that it's really
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zero-delimited. */
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strncpy(hitfile, concat, hitlen - 1);
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hitfile[hitlen - 1] = 0;
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free(envcopy);
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free(concat);
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return;
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}
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free(concat);
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envcopy2 = NULL;
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}
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/* If I fall out of that loop, then hitfile indicates no match,
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and return. */
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free(envcopy);
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}
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/* memcheck - crash out if a pointer (returned from malloc) is NULL. */
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void *memcheck(
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void *ptr)
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{
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if (ptr == NULL) {
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fprintf(stderr, "Out of memory.\n");
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exit(EXIT_FAILURE);
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}
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return ptr;
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}
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/* upcase turns a string to upper case */
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void upcase(
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char *str)
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{
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while (*str) {
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*str = toupper((unsigned char)*str);
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str++;
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}
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}
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/* downcase turns a string to lower case */
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void downcase(
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char *str)
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{
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while (*str) {
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*str = tolower((unsigned char)*str);
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str++;
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}
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}
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/* padto adds blanks to the end of a string until it's the given
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length. */
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void padto(
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char *str,
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int to)
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{
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int needspace = to - strlen(str);
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str += strlen(str);
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while (needspace > 0)
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*str++ = ' ', needspace--;
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*str = 0;
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}
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/* defext adds the supplied extension to the file name if it doesn't
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already have one. "ext" is the desired extension, without the
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period. The file name must be in a malloc'ed buffer. The
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resulting string address is returned. */
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char *defext (char *fn, const char *ext)
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{
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char *ret;
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if (strchr (fn, '.'))
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return fn;
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ret = realloc (fn, strlen (fn) + strlen (ext) + 2);
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if (ret == NULL)
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return ret;
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strcat (ret, ".");
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strcat (ret, ext);
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return ret;
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}
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