1 /*********************************************************************** 2 * * 3 * This software is part of the ast package * 4 * Copyright (c) 1992-2007 AT&T Knowledge Ventures * 5 * and is licensed under the * 6 * Common Public License, Version 1.0 * 7 * by AT&T Knowledge Ventures * 8 * * 9 * A copy of the License is available at * 10 * http://www.opensource.org/licenses/cpl1.0.txt * 11 * (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9) * 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) 1999-04-10 $\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 " 37 "defined by \astring\a has a suffix that ends in \asuffix\a, " 38 "it is removed as well.]" 39 "[+?If \astring\a consists solely of \b/\b characters the output will " 40 "be a single \b/\b unless \bPATH_LEADING_SLASHES\b returned by " 41 "\bgetconf\b(1) is \b1\b and \astring\a consists of multiple " 42 "\b/\b characters in which case \b//\b will be output. " 43 "Otherwise, trailing \b/\b characters are removed, and if " 44 "there are any remaining \b/\b characters in \astring\a, " 45 "all characters up to and including the last \b/\b are removed. " 46 "Finally, if \asuffix\a is specified, and is identical the end " 47 "of \astring\a, these characters are removed. The characters " 48 "not removed from \astring\a will be written to standard output.]" 49 "\n" 50 "\n string [suffix]\n" 51 "\n" 52 "[+EXIT STATUS?]{" 53 "[+0?Successful Completion.]" 54 "[+>0?An error occurred.]" 55 "}" 56 "[+SEE ALSO?\bdirname\b(1), \bgetconf\b(1), \bbasename\b(3)]" 57 ; 58 59 60 #include <cmd.h> 61 62 static void namebase(Sfio_t *outfile, register char *pathname, char *suffix) 63 { 64 register char *first, *last; 65 register int n=0; 66 for(first=last=pathname; *last; last++); 67 /* back over trailing '/' */ 68 if(last>first) 69 while(*--last=='/' && last > first); 70 if(last==first && *last=='/') 71 { 72 /* all '/' or "" */ 73 if(*first=='/') 74 if(*++last=='/') /* keep leading // */ 75 last++; 76 } 77 else 78 { 79 for(first=last++;first>pathname && *first!='/';first--); 80 if(*first=='/') 81 first++; 82 /* check for trailing suffix */ 83 if(suffix && (n=strlen(suffix)) && n<(last-first)) 84 { 85 if(memcmp(last-n,suffix,n)==0) 86 last -=n; 87 } 88 } 89 if(last>first) 90 sfwrite(outfile,first,last-first); 91 sfputc(outfile,'\n'); 92 } 93 94 int 95 b_basename(int argc,register char *argv[], void* context) 96 { 97 register int n; 98 99 cmdinit(argc, argv, context, ERROR_CATALOG, 0); 100 while (n = optget(argv, usage)) switch (n) 101 { 102 case ':': 103 error(2, "%s", opt_info.arg); 104 break; 105 case '?': 106 error(ERROR_usage(2), "%s", opt_info.arg); 107 break; 108 } 109 argv += opt_info.index; 110 argc -= opt_info.index; 111 if(error_info.errors || argc < 1 || argc > 2) 112 error(ERROR_usage(2), "%s", optusage(NiL)); 113 namebase(sfstdout,argv[0],argv[1]); 114 return(0); 115 } 116 117