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prsvunix.c
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1993-03-19
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/* 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
#ifndef __STDC__
/* some older systems don't declare this in pwd.h, I guess. */
extern struct passwd *getpwuid();
#endif
/* 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);
}