/*
* $Id: shlib.c,v 1.4 1993/11/08 13:21:23 pk Exp $
*/
#include <sys/param.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/file.h>
#include <sys/time.h>
#include <fcntl.h>
#include <string.h>
#include <dirent.h>
#include <a.out.h>
#include "ld.h"
/*
* Standard directories to search for files specified by -l.
*/
#ifndef STANDARD_SEARCH_DIRS
#define STANDARD_SEARCH_DIRS "/usr/lib", "/usr/local/lib"
#endif
char *standard_search_dirs[] = {
STANDARD_SEARCH_DIRS
};
int n_search_dirs;
void
add_search_dir(name)
char *name;
{
n_search_dirs++;
search_dirs = (char **)xrealloc(search_dirs,
n_search_dirs * sizeof(char *));
search_dirs[n_search_dirs - 1] = strdup(name);
}
void
std_search_dirs(paths)
char *paths;
{
char *cp;
int i, n;
if (paths != NULL)
/* Add search directories from `paths' */
while ((cp = strsep(&paths, ":")) != NULL) {
add_search_dir(cp);
if (paths)
*(paths-1) = ':';
}
/* Append standard search directories */
n = sizeof standard_search_dirs / sizeof standard_search_dirs[0];
for (i = 0; i < n; i++)
add_search_dir(standard_search_dirs[i]);
}
/*
* Return true if CP points to a valid dewey number.
* Decode and leave the result in the array DEWEY.
* Return the number of decoded entries in DEWEY.
*/
int
getdewey(dewey, cp)
int dewey[];
char *cp;
{
int i, n;
for (n = 0, i = 0; i < MAXDEWEY; i++) {
if (*cp == '\0')
break;
if (*cp == '.') cp++;
if (!isdigit(*cp))
return 0;
dewey[n++] = strtol(cp, &cp, 10);
}
return n;
}
/*
* Compare two dewey arrays.
* Return -1 if `d1' represents a smaller value than `d2'.
* Return 1 if `d1' represents a greater value than `d2'.
* Return 0 if equal.
*/
int
cmpndewey(d1, n1, d2, n2)
int d1[], d2[];
int n1, n2;
{
int i;
for (i = 0; i < n1 && i < n2; i++) {
if (d1[i] < d2[i])
return -1;
if (d1[i] > d2[i])
return 1;
}
if (n1 == n2)
return 0;
if (i == n1)
return -1;
if (i == n2)
return 1;
}
/*
* Search directories for a shared library matching the given
* major and minor version numbers.
*
* MAJOR == -1 && MINOR == -1 --> find highest version
* MAJOR != -1 && MINOR == -1 --> find highest minor version
* MAJOR == -1 && MINOR != -1 --> invalid
* MAJOR != -1 && MINOR != -1 --> find highest micro version
*/
/* Not interested in devices right now... */
#undef major
#undef minor
char *
findshlib(name, majorp, minorp)
char *name;
int *majorp, *minorp;
{
int dewey[MAXDEWEY];
int ndewey;
int tmp[MAXDEWEY];
int i;
int len;
char *lname, *path = NULL;
int major = *majorp, minor = *minorp;
len = strlen(name);
lname = (char *)alloca(len + sizeof("lib"));
sprintf(lname, "lib%s", name);
len += 3;
ndewey = 0;
for (i = 0; i < n_search_dirs; i++) {
DIR *dd = opendir(search_dirs[i]);
struct dirent *dp;
if (dd == NULL)
continue;
while ((dp = readdir(dd)) != NULL) {
int n, j, might_take_it = 0;
if (dp->d_namlen < len + 4)
continue;
if (strncmp(dp->d_name, lname, len) != 0)
continue;
if (strncmp(dp->d_name+len, ".so.", 4) != 0)
continue;
if ((n = getdewey(tmp, dp->d_name+len+4)) == 0)
continue;
if (major == -1 && minor == -1) {
might_take_it = 1;
} else if (major != -1 && minor == -1) {
if (tmp[0] == major)
might_take_it = 1;
} else if (major != -1 && minor != -1) {
if (tmp[0] == major)
if (n == 1 || tmp[1] >= minor)
might_take_it = 1;
}
if (!might_take_it)
continue;
if (cmpndewey(tmp, n, dewey, ndewey) <= 0)
continue;
/* We have a better version */
if (path)
free(path);
path = concat(search_dirs[i], "/", dp->d_name);
bcopy(tmp, dewey, sizeof(dewey));
ndewey = n;
*majorp = dewey[0];
*minorp = dewey[1];
}
closedir(dd);
}
return path;
}
