remove.c

[詳解]

/*++
/* NAME
/*  REMOVE 3
/* SUMMARY
/*  remove or stash away file
/* SYNOPSIS
/*  \fBint  REMOVE(path)\fR
/*  \fBconst char *path;\fR
/* DESCRIPTION
/*  \fBREMOVE()\fR removes a file, or renames it to a unique name,
/*  depending on the setting of the boolean \fBvar_dont_remove\fR
/*  flag.
/* DIAGNOSTICS
/*  The result is 0 in case of success, -1 in case of trouble.
/*  The global \fBerrno\fR variable reflects the nature of the
/*  problem.
/* FILES
/*  saved/*, stashed-away files.
/* SEE ALSO
/*  remove(3)
/* LICENSE
/* .ad
/* .fi
/*  The Secure Mailer license must be distributed with this software.
/* AUTHOR(S)
/*  Wietse Venema
/*  IBM T.J. Watson Research
/*  P.O. Box 704
/*  Yorktown Heights, NY 10598, USA
/*--*/

/* System library. */

#include <sys_defs.h>
#include <sys/stat.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <warn_stat.h>

/* Utility library. */

#include <vstring.h>

/* Global library. */

#include <mail_params.h>

/* REMOVE - squirrel away a file instead of removing it */

int     REMOVE(const char *path)
{
    static VSTRING *dest;
    char   *slash;
    struct stat st;

    if (var_dont_remove == 0) {
    return (remove(path));
    } else {
    if (dest == 0)
        dest = vstring_alloc(10);
    vstring_sprintf(dest, "saved/%s", ((slash = strrchr(path, '/')) != 0) ?
            slash + 1 : path);
    for (;;) {
        if (stat(vstring_str(dest), &st) < 0)
        break;
        vstring_strcat(dest, "+");
    }
    return (rename(path, vstring_str(dest)));
    }
}