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Annotation of 41BSD/cmd/ucbmail/getname.c, revision 1.1

1.1     ! root        1: #
        !             2: 
        !             3: 
        !             4: /*
        !             5:  * Getname / getuserid for those with no
        !             6:  * hashed passwd data base).
        !             7:  * Do not compile this module in if you DO have hashed
        !             8:  * passwd's -- this is slower.
        !             9:  *
        !            10:  * Also provided here is a getpw routine which can share
        !            11:  * the open file.  This is used for the Version 6 getenv
        !            12:  * implementation.
        !            13:  */
        !            14: 
        !            15: #include "rcv.h"
        !            16: 
        !            17: static FILE *pwfile =  NULL;           /* Pw file held open */
        !            18: static char *pwname =  "/etc/passwd";  /* Name of passwd file */
        !            19: 
        !            20: /*
        !            21:  * Search the passwd file for a uid.  Return name through ref parameter
        !            22:  * if found, indicating success with 0 return.  Return -1 on error.
        !            23:  * If -1 is passed as the user id, close the passwd file.
        !            24:  */
        !            25: 
        !            26: getname(uid, namebuf)
        !            27:        char namebuf[];
        !            28: {
        !            29:        register char *cp, *cp2;
        !            30:        char linebuf[BUFSIZ];
        !            31: 
        !            32:        if (uid == -1) {
        !            33:                if (pwfile != NULL)
        !            34:                        fclose(pwfile);
        !            35:                pwfile = NULL;
        !            36:                return(0);
        !            37:        }
        !            38:        if (pwfile == NULL && (pwfile = fopen(pwname, "r")) == NULL)
        !            39:                return(-1);
        !            40:        rewind(pwfile);
        !            41:        while (fgets(linebuf, BUFSIZ, pwfile) != NULL)
        !            42:                if (pweval(linebuf) == uid) {
        !            43:                        for (cp = linebuf, cp2 = namebuf; *cp != ':';
        !            44:                            *cp2++ = *cp++)
        !            45:                                ;
        !            46:                        *cp2 = '\0';
        !            47:                        return(0);
        !            48:                }
        !            49:        return(-1);
        !            50: }
        !            51: 
        !            52: /*
        !            53:  * Read the users password file line into the passed line
        !            54:  * buffer.
        !            55:  */
        !            56: 
        !            57: getpw(uid, linebuf)
        !            58:        char linebuf[];
        !            59: {
        !            60:        register char *cp, *cp2;
        !            61: 
        !            62:        if (uid == -1) {
        !            63:                if (pwfile != NULL)
        !            64:                        fclose(pwfile);
        !            65:                pwfile = NULL;
        !            66:                return(0);
        !            67:        }
        !            68:        if (pwfile == NULL && (pwfile = fopen(pwname, "r")) == NULL)
        !            69:                return(-1);
        !            70:        rewind(pwfile);
        !            71:        while (fgets(linebuf, BUFSIZ, pwfile) != NULL)
        !            72:                if (pweval(linebuf) == uid) {
        !            73:                        if (linebuf[0] != '\0')
        !            74:                                linebuf[strlen(linebuf)-1] = '\0';
        !            75:                        return(0);
        !            76:                }
        !            77:        return(-1);
        !            78: }
        !            79: 
        !            80: /*
        !            81:  * Look for passwd line belonging to 'name'
        !            82:  */
        !            83: 
        !            84: getpwnam(name, linebuf)
        !            85:        char name[], linebuf[];
        !            86: {
        !            87:        register char *cp, *cp2;
        !            88: 
        !            89:        if (name == NOSTR) {
        !            90:                if (pwfile != NULL)
        !            91:                        fclose(pwfile);
        !            92:                pwfile = NULL;
        !            93:                return(0);
        !            94:        }
        !            95:        if (pwfile == NULL && (pwfile = fopen(pwname, "r")) == NULL) {
        !            96:                perror(pwname);
        !            97:                return(-1);
        !            98:        }
        !            99:        rewind(pwfile);
        !           100:        while (fgets(linebuf, BUFSIZ, pwfile) != NULL) {
        !           101:                cp = linebuf;
        !           102:                cp2 = name;
        !           103:                while (*cp2++ == *cp++)
        !           104:                        ;
        !           105:                if (*--cp == ':' && *--cp2 == 0)
        !           106:                        return(0);
        !           107:        }
        !           108:        return(-1);
        !           109: }
        !           110: 
        !           111: /*
        !           112:  * Convert the passed name to a user id and return it.  Return -1
        !           113:  * on error.  Iff the name passed is -1 (yech) close the pwfile.
        !           114:  */
        !           115: 
        !           116: getuserid(name)
        !           117:        char name[];
        !           118: {
        !           119:        register char *cp, *cp2;
        !           120:        char linebuf[BUFSIZ];
        !           121: 
        !           122:        if (name == (char *) -1) {
        !           123:                if (pwfile != NULL)
        !           124:                        fclose(pwfile);
        !           125:                pwfile = NULL;
        !           126:                return(0);
        !           127:        }
        !           128:        if (pwfile == NULL && (pwfile = fopen(pwname, "r")) == NULL)
        !           129:                return(-1);
        !           130:        rewind(pwfile);
        !           131:        while (fgets(linebuf, BUFSIZ, pwfile) != NULL) {
        !           132:                for (cp = name, cp2 = linebuf; *cp++ == *cp2++;)
        !           133:                        ;
        !           134:                if (*--cp == '\0' && *--cp2 == ':')
        !           135:                        return(pweval(linebuf));
        !           136:        }
        !           137:        return(-1);
        !           138: }
        !           139: 
        !           140: /*
        !           141:  * Evaluate the user id of the passed passwd line and return it.
        !           142:  */
        !           143: 
        !           144: static
        !           145: pweval(line)
        !           146:        char line[];
        !           147: {
        !           148:        register char *cp;
        !           149:        register int i;
        !           150:        register int uid;
        !           151: 
        !           152:        for (cp = line, i = 0; i < 2; i += (*cp++ == ':'))
        !           153:                ;
        !           154:        uid = atoi(cp);
        !           155: 
        !           156: #ifdef UIDGID
        !           157:        while (*cp && *cp != ':')
        !           158:                cp++;
        !           159:        cp++;
        !           160:        uid |= atoi(cp) << 8;
        !           161: #endif
        !           162: 
        !           163:        return(uid);
        !           164: }

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