162 lines
2.5 KiB
C
162 lines
2.5 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include <errno.h>
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#include <limits.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include "imapfilter.h"
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#include "pathnames.h"
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extern environment env;
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/*
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* Create imapfilter's home directory.
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*/
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void
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create_homedir(void)
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{
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int n;
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char *h, *i;
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h = getenv("HOME");
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i = getenv("IMAPFILTER_HOME");
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if (i == NULL)
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n = strlen(h ? h : "") + strlen(h ? "/" : "") +
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strlen(".imapfilter");
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else
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n = strlen(i);
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if (env.pathmax != -1 && n > env.pathmax)
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fatal(ERROR_PATHNAME,
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"pathname limit %ld exceeded: %d\n", env.pathmax, n);
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env.home = (char *)xmalloc((n + 1) * sizeof(char));
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if (i == NULL)
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snprintf(env.home, n + 1, "%s%s%s", h ? h : "", h ? "/" : "",
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".imapfilter");
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else
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snprintf(env.home, n + 1, "%s", i);
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if (!exists_dir(env.home)) {
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if (mkdir(env.home, S_IRUSR | S_IWUSR | S_IXUSR))
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error("could not create directory %s; %s\n", env.home,
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strerror(errno));
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}
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}
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/*
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* Check if a file exists.
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*/
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int
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exists_file(char *fname)
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{
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struct stat fs;
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if (access(fname, F_OK))
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return 0;
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stat(fname, &fs);
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if (!S_ISREG(fs.st_mode)) {
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error("file %s not a regular file\n", fname);
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return -1;
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}
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return 1;
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}
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/*
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* Check if a directory exists.
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*/
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int
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exists_dir(char *dname)
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{
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struct stat ds;
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if (access(dname, F_OK))
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return 0;
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stat(dname, &ds);
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if (!S_ISDIR(ds.st_mode)) {
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error("file %s not a directory\n", dname);
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return -1;
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}
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return 1;
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}
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/*
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* Create a file with the specified permissions.
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*/
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int
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create_file(char *fname, mode_t mode)
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{
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int fd;
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fd = 0;
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if (!exists_file(fname)) {
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fd = open(fname, O_CREAT | O_WRONLY | O_TRUNC, mode);
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if (fd == -1) {
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error("could not create file %s; %s\n", fname,
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strerror(errno));
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return -1;
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}
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close(fd);
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}
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return 0;
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}
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/*
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* Get the system's maximum number of bytes in a pathname.
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*/
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int
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get_pathmax(void)
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{
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int n;
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errno = 0;
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n = pathconf("/", _PC_PATH_MAX);
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if (n == -1 && errno != 0) {
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error("getting PATH_MAX limit; %s\n", strerror(errno));
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return -1;
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}
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env.pathmax = n;
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return 0;
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}
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/*
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* Get the path of a file inside the configuration directory.
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*/
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char *
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get_filepath(char *fname)
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{
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int n;
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char *fp;
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n = strlen(env.home) + strlen("/") + strlen(fname);
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if (env.pathmax != -1 && n > env.pathmax)
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fatal(ERROR_PATHNAME,
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"pathname limit %ld exceeded: %d\n", env.pathmax, n);
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fp = (char *)xmalloc((n + 1) * sizeof(char));
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snprintf(fp, n + 1, "%s/%s", env.home, fname);
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return fp;
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}
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