source: trunk/minix/commands/elvis/prsvunix.c@ 20

/* prsvunix.c */

/* This file contains the UNIX-specific parts of the "elvprsv" program. */

#if OSK
#define ELVPRSV
#include "osk.c"
#else
#include <sys/stat.h>
#include <pwd.h>
#endif
extern struct passwd *getpwuid();

/* This variable is used to add extra error messages for mail sent to root */
char *ps;

/* This function returns the login name of the owner of a file */
char *ownername(filename)
        char    *filename;      /* name of a file */
{
        struct stat     st;
        struct passwd   *pw;

        /* stat the file, to get its uid */
        if (stat(filename, &st) < 0)
        {
                ps = "stat() failed";
                return "root";
        }

        /* get the /etc/passwd entry for that user */
        pw = getpwuid(st.st_uid);
        if (!pw)
        {
                ps = "uid not found in password file";
                return "root";
        }

        /* return the user's name */
        return pw->pw_name;
}


/* This function sends a mail message to a given user, saying that a file
 * has been preserved.
 */
void mail(user, file, when)
        char    *user;  /* name of user who should receive the mail */
        char    *file;  /* name of original text file that was preserved */
        char    *when;  /* description of why the file was preserved */
{
        char    cmd[80];/* buffer used for constructing a "mail" command */
        FILE    *m, *popen();   /* stream used for giving text to the "mail" program */
        char    *base;  /* basename of the file */

        /* separate the directory name from the basename. */
        for (base = file + strlen(file); --base > file && *base != SLASH; )
        {
        }
        if (*base == SLASH)
        {
                *base++ = '\0';
        }

        /* for anonymous buffers, pretend the name was "foo" */
        if (!strcmp(base, "*"))
        {
                base = "foo";
        }

        /* open a pipe to the "mail" program */
#if OSK
        sprintf(cmd, "mail \"-s=%s preserved!\" %s", base, user);
#else /* ANY_UNIX */
        sprintf(cmd, "mail %s >/dev/null 2>/dev/null", user);
#endif
        m = popen(cmd, "w");
        if (!m)
        {
                /* Can't send mail!  Hope the user figures it out. */
                return;
        }

        /* Tell the user that the file was preserved */
        fprintf(m, "A version of your file \"%s%c%s\"\n", file, SLASH, base);
        fprintf(m, "was preserved when %s.\n", when);
        fprintf(m, "To recover this file, do the following:\n");
        fprintf(m, "\n");
#if OSK
        fprintf(m, "     chd %s\n", file);
#else /* ANY_UNIX */
        fprintf(m, "     cd %s\n", file);
#endif
        fprintf(m, "     elvrec %s\n", base);
        fprintf(m, "\n");
        fprintf(m, "With fond wishes for a speedy recovery,\n");
        fprintf(m, "                                    Elvis\n");
        if (ps)
        {
                fprintf(m, "\nP.S. %s\n", ps);
                ps = (char *)0;
        }

        /* close the stream */
        pclose(m);
}