1 /***********************************************************************
2 * *
3 * This software is part of the ast package *
4 * Copyright (c) 1992-2012 AT&T Intellectual Property *
5 * and is licensed under the *
6 * Eclipse Public License, Version 1.0 *
7 * by AT&T Intellectual Property *
8 * *
9 * A copy of the License is available at *
10 * http://www.eclipse.org/org/documents/epl-v10.html *
11 * (with md5 checksum b35adb5213ca9657e911e9befb180842) *
12 * *
13 * Information and Software Systems Research *
14 * AT&T Research *
15 * Florham Park NJ *
16 * *
17 * Glenn Fowler <gsf@research.att.com> *
18 * David Korn <dgk@research.att.com> *
19 * *
20 ***********************************************************************/
21 #pragma prototyped
22 /*
23 * David Korn
24 * AT&T Bell Laboratories
25 *
26 * namebase pathname [suffix]
27 *
28 * print the namebase of a pathname
29 */
30
31 static const char usage[] =
32 "[-?\n@(#)$Id: basename (AT&T Research) 2010-05-06 $\n]"
33 USAGE_LICENSE
34 "[+NAME?basename - strip directory and suffix from filenames]"
35 "[+DESCRIPTION?\bbasename\b removes all leading directory components "
36 "from the file name defined by \astring\a. If the file name defined by "
37 "\astring\a has a suffix that ends in \asuffix\a, it is removed as "
38 "well.]"
39 "[+?If \astring\a consists solely of \b/\b characters the output will be "
40 "a single \b/\b unless \bPATH_LEADING_SLASHES\b returned by "
41 "\bgetconf\b(1) is \b1\b and \astring\a consists of multiple \b/\b "
42 "characters in which case \b//\b will be output. Otherwise, trailing "
43 "\b/\b characters are removed, and if there are any remaining \b/\b "
44 "characters in \astring\a, all characters up to and including the last "
45 "\b/\b are removed. Finally, if \asuffix\a is specified, and is "
46 "identical the end of \astring\a, these characters are removed. The "
47 "characters not removed from \astring\a will be written on a single line "
48 "to the standard output.]"
49 "[a:all?All operands are treated as \astring\a and each modified "
50 "pathname is printed on a separate line on the standard output.]"
51 "[s:suffix?All operands are treated as \astring\a and each modified "
52 "pathname, with \asuffix\a removed if it exists, is printed on a "
53 "separate line on the standard output.]:[suffix]"
54 "\n"
55 "\n string [suffix]\n"
56 "string ...\n"
57 "\n"
58 "[+EXIT STATUS?]"
59 "{"
60 "[+0?Successful Completion.]"
61 "[+>0?An error occurred.]"
62 "}"
63 "[+SEE ALSO?\bdirname\b(1), \bgetconf\b(1), \bbasename\b(3)]"
64 ;
65
66
67 #include <cmd.h>
68
namebase(Sfio_t * outfile,register char * pathname,char * suffix)69 static void namebase(Sfio_t *outfile, register char *pathname, char *suffix)
70 {
71 register char *first, *last;
72 register int n=0;
73 for(first=last=pathname; *last; last++);
74 /* back over trailing '/' */
75 if(last>first)
76 while(*--last=='/' && last > first);
77 if(last==first && *last=='/')
78 {
79 /* all '/' or "" */
80 if(*first=='/')
81 if(*++last=='/') /* keep leading // */
82 last++;
83 }
84 else
85 {
86 for(first=last++;first>pathname && *first!='/';first--);
87 if(*first=='/')
88 first++;
89 /* check for trailing suffix */
90 if(suffix && (n=strlen(suffix)) && n<(last-first))
91 {
92 if(memcmp(last-n,suffix,n)==0)
93 last -=n;
94 }
95 }
96 if(last>first)
97 sfwrite(outfile,first,last-first);
98 sfputc(outfile,'\n');
99 }
100
101 int
b_basename(int argc,register char ** argv,Shbltin_t * context)102 b_basename(int argc, register char** argv, Shbltin_t* context)
103 {
104 char* string;
105 char* suffix = 0;
106 int all = 0;
107
108 cmdinit(argc, argv, context, ERROR_CATALOG, 0);
109 for (;;)
110 {
111 switch (optget(argv, usage))
112 {
113 case 'a':
114 all = 1;
115 continue;
116 case 's':
117 all = 1;
118 suffix = opt_info.arg;
119 continue;
120 case ':':
121 error(2, "%s", opt_info.arg);
122 break;
123 case '?':
124 error(ERROR_usage(2), "%s", opt_info.arg);
125 break;
126 }
127 break;
128 }
129 argv += opt_info.index;
130 argc -= opt_info.index;
131 if (error_info.errors || argc < 1 || !all && argc > 2)
132 error(ERROR_usage(2), "%s", optusage(NiL));
133 if (!all)
134 namebase(sfstdout, argv[0], argv[1]);
135 else
136 while (string = *argv++)
137 namebase(sfstdout, string, suffix);
138 return 0;
139 }
140