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Annotation of coherent/b/lib/libc/gen/getpwent.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * libc/gen/getpwent.c
        !             3:  * Coherent I/O Library.
        !             4:  * Get password file entry.
        !             5:  * Searches by next entry, name or numerical id.
        !             6:  */
        !             7: 
        !             8: #include <stdio.h>
        !             9: #include <pwd.h>
        !            10: 
        !            11: #define field(x)       { x=cp; while (*cp++); }
        !            12: #define        NPWLINE 120
        !            13: #define        PWFILE  "/etc/passwd"
        !            14: 
        !            15: static char    pwline[NPWLINE];
        !            16: static struct  passwd pw;
        !            17: static FILE    *pwfile = { NULL };
        !            18: 
        !            19: struct passwd *
        !            20: getpwnam(name)
        !            21: char *name;
        !            22: {
        !            23:        register struct passwd *pwp;
        !            24: 
        !            25:        setpwent();
        !            26:        while ((pwp = getpwent()) != NULL)
        !            27:                if (streq(name, pwp->pw_name))
        !            28:                        return pwp;
        !            29:        return NULL;
        !            30: }
        !            31: 
        !            32: struct passwd *
        !            33: getpwuid(uid)
        !            34: {
        !            35:        register struct passwd *pwp;
        !            36: 
        !            37:        setpwent();
        !            38:        while ((pwp = getpwent()) != NULL)
        !            39:                if (uid == pwp->pw_uid)
        !            40:                        return pwp;
        !            41:        return NULL;
        !            42: }
        !            43: 
        !            44: struct passwd *
        !            45: getpwent()
        !            46: {
        !            47:        register char *cp, *xp;
        !            48:        register int c, nseps;
        !            49: 
        !            50:        if (pwfile == NULL)
        !            51:                if ((pwfile = fopen(PWFILE, "r")) == NULL)
        !            52:                        return NULL;
        !            53: again:
        !            54:        cp = pwline;
        !            55:        for (nseps = 0; (c = getc(pwfile))!=EOF && c!='\n'; ) {
        !            56:                if (c == ':') {
        !            57:                        c = '\0';
        !            58:                        ++nseps;
        !            59:                }
        !            60:                if (cp < &pwline[NPWLINE-1])
        !            61:                        *cp++ = c;
        !            62:        }
        !            63:        if (c == EOF)
        !            64:                return NULL;
        !            65:        if (nseps != 6)
        !            66:                goto again;             /* accept only lines with six ':'s */
        !            67:        *cp = '\0';
        !            68:        cp = pwline;
        !            69:        field(pw.pw_name);
        !            70:        field(pw.pw_passwd);
        !            71:        field(xp);
        !            72:        pw.pw_uid = atoi(xp);
        !            73:        field(xp);
        !            74:        pw.pw_gid = atoi(xp);
        !            75:        field(pw.pw_comment);
        !            76:        pw.pw_gecos = pw.pw_comment;
        !            77:        field(pw.pw_dir);
        !            78:        field(pw.pw_shell);
        !            79:        return &pw;
        !            80: }
        !            81: 
        !            82: setpwent()
        !            83: {
        !            84:        if (pwfile != NULL)
        !            85:                rewind(pwfile);
        !            86: }
        !            87: 
        !            88: endpwent()
        !            89: {
        !            90:        if (pwfile != NULL) {
        !            91:                fclose(pwfile);
        !            92:                pwfile = NULL;
        !            93:        }
        !            94: }
        !            95: 
        !            96: /* end of getpwent.c */

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