1 /*********************************************************************** 2 * * 3 * This software is part of the ast package * 4 * Copyright (c) 1992-2008 AT&T Intellectual Property * 5 * and is licensed under the * 6 * Common Public License, Version 1.0 * 7 * by AT&T Intellectual Property * 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 * rev [-l] [file ...] 24 * 25 * reverse the characters or lines of one or more files 26 * 27 * David Korn 28 * AT&T Laboratories 29 * dgk@research.att.com 30 * 31 */ 32 33 static const char usage[] = 34 "[-?\n@(#)$Id: rev (AT&T Research) 2007-11-29 $\n]" 35 USAGE_LICENSE 36 "[+NAME?rev - reverse the characters or lines of one or more files]" 37 "[+DESCRIPTION?\brev\b copies one or more files to standard output " 38 "reversing the order of characters on every line of the file " 39 "or reversing the order of lines of the file if \b-l\b is specified.]" 40 "[+?If no \afile\a is given, or if the \afile\a is \b-\b, \brev\b " 41 "copies from standard input starting at the current offset.]" 42 "[l:line?Reverse the lines of the file.]" 43 44 "\n" 45 "\n[file ...]\n" 46 "\n" 47 "[+EXIT STATUS?]{" 48 "[+0?All files copied successfully.]" 49 "[+>0?One or more files did not copy.]" 50 "}" 51 "[+SEE ALSO?\bcat\b(1), \btail\b(1)]" 52 ; 53 54 #include <cmd.h> 55 #include <rev.h> 56 57 /* 58 * reverse the characters within a line 59 */ 60 static int rev_char(Sfio_t *in, Sfio_t *out) 61 { 62 register int c; 63 register char *ep, *bp, *cp; 64 register wchar_t *wp, *xp; 65 register size_t n; 66 register size_t w; 67 if (mbwide()) 68 { 69 wp = 0; 70 w = 0; 71 while(cp = bp = sfgetr(in,'\n',0)) 72 { 73 ep = bp + (n=sfvalue(in)) - 1; 74 if (n > w) 75 { 76 w = roundof(n + 1, 1024); 77 if (!(wp = newof(wp, wchar_t, w, 0))) 78 { 79 error(ERROR_SYSTEM|2, "out of space"); 80 return 0; 81 } 82 } 83 xp = wp; 84 while (cp < ep) 85 *xp++ = mbchar(cp); 86 cp = bp; 87 while (xp > wp) 88 cp += mbconv(cp, *--xp); 89 *cp++ = '\n'; 90 if (sfwrite(out, bp, cp - bp) < 0) 91 return -1; 92 } 93 if (wp) 94 free(wp); 95 } 96 else 97 while(cp = bp = sfgetr(in,'\n',0)) 98 { 99 ep = bp + (n=sfvalue(in)) -1; 100 while(ep > bp) 101 { 102 c = *--ep; 103 *ep = *bp; 104 *bp++ = c; 105 } 106 if(sfwrite(out,cp,n)<0) 107 return(-1); 108 } 109 return(0); 110 } 111 112 int 113 b_rev(int argc, register char** argv, void* context) 114 { 115 register Sfio_t *fp; 116 register char *cp; 117 register int n, line=0; 118 NOT_USED(argc); 119 120 cmdinit(argc, argv, context, ERROR_CATALOG, 0); 121 while (n = optget(argv, usage)) switch (n) 122 { 123 case 'l': 124 line=1; 125 break; 126 case ':': 127 error(2, "%s", opt_info.arg); 128 break; 129 case '?': 130 error(ERROR_usage(2), "%s", opt_info.arg); 131 break; 132 } 133 argv += opt_info.index; 134 if(error_info.errors) 135 error(ERROR_usage(2),"%s",optusage((char*)0)); 136 n=0; 137 if(cp = *argv) 138 argv++; 139 do 140 { 141 if(!cp || streq(cp,"-")) 142 fp = sfstdin; 143 else if(!(fp = sfopen((Sfio_t*)0,cp,"r"))) 144 { 145 error(ERROR_system(0),"%s: cannot open",cp); 146 n=1; 147 continue; 148 } 149 if(line) 150 line = rev_line(fp,sfstdout,sftell(fp)); 151 else 152 line = rev_char(fp,sfstdout); 153 if(fp!=sfstdin) 154 sfclose(fp); 155 if(line < 0) 156 error(ERROR_system(1),"write failed"); 157 } 158 while(cp= *argv++); 159 return(n); 160 } 161