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Annotation of coherent/g/usr/bin/pax/pathname.c, revision 1.1

1.1     ! root        1: /* $Source: /src386/usr/bin/pax/pathname.c,v $
        !             2:  *
        !             3:  * $Revision: 1.1 $
        !             4:  *
        !             5:  * pathname.c - directory/pathname support functions 
        !             6:  *
        !             7:  * DESCRIPTION
        !             8:  *
        !             9:  *     These functions provide directory/pathname support for PAX
        !            10:  *
        !            11:  * AUTHOR
        !            12:  *
        !            13:  *     Mark H. Colburn, NAPS International ([email protected])
        !            14:  *
        !            15:  * Sponsored by The USENIX Association for public distribution. 
        !            16:  *
        !            17:  * Copyright (c) 1989 Mark H. Colburn.
        !            18:  * All rights reserved.
        !            19:  *
        !            20:  * Redistribution and use in source and binary forms are permitted
        !            21:  * provided that the above copyright notice is duplicated in all such 
        !            22:  * forms and that any documentation, advertising materials, and other 
        !            23:  * materials related to such distribution and use acknowledge that the 
        !            24:  * software was developed * by Mark H. Colburn and sponsored by The 
        !            25:  * USENIX Association. 
        !            26:  *
        !            27:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
        !            28:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
        !            29:  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            30:  *
        !            31:  * $Log:       pathname.c,v $
        !            32:  * Revision 1.1  92/08/28  08:02:47  bin
        !            33:  * Initial revision
        !            34:  * 
        !            35:  * Revision 1.1  89/02/14  16:48:23  jep
        !            36:  * Initial revision
        !            37:  * 
        !            38:  * Revision 1.1  88/12/23  18:02:21  mark
        !            39:  * Initial revision
        !            40:  * 
        !            41:  */
        !            42: 
        !            43: #ifndef lint
        !            44: static char *ident = "$Id: pathname.c,v 1.1 92/08/28 08:02:47 bin Exp Locker: bin $";
        !            45: static char *copyright = "Copyright (c) 1989 Mark H. Colburn.\nAll rights reserved.\n";
        !            46: #endif /* ! lint */
        !            47: 
        !            48: 
        !            49: /* Headers */
        !            50: 
        !            51: #include "pax.h"
        !            52: 
        !            53: 
        !            54: /* dirneed  - checks for the existance of directories and possibly create
        !            55:  *
        !            56:  * DESCRIPTION
        !            57:  *
        !            58:  *     Dirneed checks to see if a directory of the name pointed to by name
        !            59:  *     exists.  If the directory does exist, then dirneed returns 0.  If
        !            60:  *     the directory does not exist and the f_dir_create flag is set,
        !            61:  *     then dirneed will create the needed directory, recursively creating
        !            62:  *     any needed intermediate directory.
        !            63:  *
        !            64:  *     If f_dir_create is not set, then no directories will be created
        !            65:  *     and a value of -1 will be returned if the directory does not
        !            66:  *     exist.
        !            67:  *
        !            68:  * PARAMETERS
        !            69:  *
        !            70:  *     name            - name of the directory to create
        !            71:  *
        !            72:  * RETURNS
        !            73:  *
        !            74:  *     Returns a 0 if the creation of the directory succeeded or if the
        !            75:  *     directory already existed.  If the f_dir_create flag was not set
        !            76:  *     and the named directory does not exist, or the directory creation 
        !            77:  *     failed, a -1 will be returned to the calling routine.
        !            78:  */
        !            79: 
        !            80: #if __STDC__
        !            81: 
        !            82: int dirneed(char *name)
        !            83: 
        !            84: #else
        !            85: 
        !            86: int dirneed(name)
        !            87: char           *name;
        !            88: 
        !            89: #endif
        !            90: {
        !            91:     char           *cp;
        !            92:     char           *last;
        !            93:     int             ok;
        !            94:     static Stat     sb;
        !            95: 
        !            96:     last = (char *)NULL;
        !            97:     for (cp = name; *cp;) {
        !            98:        if (*cp++ == '/') {
        !            99:            last = cp;
        !           100:        }
        !           101:     }
        !           102:     if (last == (char *)NULL) {
        !           103:        return (STAT(".", &sb));
        !           104:     }
        !           105:     *--last = '\0';
        !           106:     ok = STAT(*name ? name : ".", &sb) == 0
        !           107:        ? ((sb.sb_mode & S_IFMT) == S_IFDIR)
        !           108:        : (f_dir_create && dirneed(name) == 0 && dirmake(name, &sb) == 0);
        !           109:     *last = '/';
        !           110:     return (ok ? 0 : -1);
        !           111: }
        !           112: 
        !           113: 
        !           114: /* nameopt - optimize a pathname
        !           115:  *
        !           116:  * DESCRIPTION
        !           117:  *
        !           118:  *     Confused by "<symlink>/.." twistiness. Returns the number of final 
        !           119:  *     pathname elements (zero for "/" or ".") or -1 if unsuccessful. 
        !           120:  *
        !           121:  * PARAMETERS
        !           122:  *
        !           123:  *     char    *begin  - name of the path to optimize
        !           124:  *
        !           125:  * RETURNS
        !           126:  *
        !           127:  *     Returns 0 if successful, non-zero otherwise.
        !           128:  *
        !           129:  */
        !           130: 
        !           131: #if __STDC__
        !           132: 
        !           133: int nameopt(char *begin)
        !           134: 
        !           135: #else
        !           136: 
        !           137: int nameopt(begin)
        !           138: char           *begin;
        !           139: 
        !           140: #endif
        !           141: {
        !           142:     char           *name;
        !           143:     char           *item;
        !           144:     int             idx;
        !           145:     int             absolute;
        !           146:     char           *element[PATHELEM];
        !           147: 
        !           148:     absolute = (*(name = begin) == '/');
        !           149:     idx = 0;
        !           150:     for (;;) {
        !           151:        if (idx == PATHELEM) {
        !           152:            warn(begin, "Too many elements");
        !           153:            return (-1);
        !           154:        }
        !           155:        while (*name == '/') {
        !           156:            ++name;
        !           157:        }
        !           158:        if (*name == '\0') {
        !           159:            break;
        !           160:        }
        !           161:        element[idx] = item = name;
        !           162:        while (*name && *name != '/') {
        !           163:            ++name;
        !           164:        }
        !           165:        if (*name) {
        !           166:            *name++ = '\0';
        !           167:        }
        !           168:        if (strcmp(item, "..") == 0) {
        !           169:            if (idx == 0) {
        !           170:                if (!absolute) {
        !           171:                    ++idx;
        !           172:                }
        !           173:            } else if (strcmp(element[idx - 1], "..") == 0) {
        !           174:                ++idx;
        !           175:            } else {
        !           176:                --idx;
        !           177:            }
        !           178:        } else if (strcmp(item, ".") != 0) {
        !           179:            ++idx;
        !           180:        }
        !           181:     }
        !           182:     if (idx == 0) {
        !           183:        element[idx++] = absolute ? "" : "."; 
        !           184:     }
        !           185:     element[idx] = (char *)NULL;
        !           186:     name = begin;
        !           187:     if (absolute) {
        !           188:        *name++ = '/';
        !           189:     }
        !           190:     for (idx = 0; item = element[idx]; ++idx, *name++ = '/') {
        !           191:        while (*item) {
        !           192:            *name++ = *item++;
        !           193:        }
        !           194:     }
        !           195:     *--name = '\0';
        !           196:     return (idx);
        !           197: }
        !           198: 
        !           199: 
        !           200: /* dirmake - make a directory  
        !           201:  *
        !           202:  * DESCRIPTION
        !           203:  *
        !           204:  *     Dirmake makes a directory with the appropritate permissions.
        !           205:  *
        !           206:  * PARAMETERS
        !           207:  *
        !           208:  *     char    *name   - Name of directory make
        !           209:  *     Stat    *asb    - Stat structure of directory to make
        !           210:  *
        !           211:  * RETURNS
        !           212:  *
        !           213:  *     Returns zero if successful, -1 otherwise. 
        !           214:  *
        !           215:  */
        !           216: 
        !           217: #if __STDC__
        !           218: 
        !           219: int dirmake(char *name, Stat *asb)
        !           220: 
        !           221: #else
        !           222: 
        !           223: int dirmake(name, asb)
        !           224: char           *name;
        !           225: Stat           *asb;
        !           226: 
        !           227: #endif
        !           228: {
        !           229:     if (mkdir(name, (int) (asb->sb_mode & S_IPOPN)) < 0) {
        !           230:        return (-1);
        !           231:     }
        !           232:     if (asb->sb_mode & S_IPEXE) {
        !           233:        chmod(name, (int) (asb->sb_mode & S_IPERM));
        !           234:     }
        !           235:     if (f_owner) {
        !           236:        chown(name, (int) asb->sb_uid, (int) asb->sb_gid);
        !           237:     }
        !           238:     return (0);
        !           239: }

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