1 /*- 2 * Copyright (c) 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 #ifndef lint 31 static const char copyright[] = 32 "@(#) Copyright (c) 1993\n\ 33 The Regents of the University of California. All rights reserved.\n"; 34 #endif /* not lint */ 35 36 #ifndef lint 37 #if 0 38 static char sccsid[] = "@(#)lam.c 8.1 (Berkeley) 6/6/93"; 39 #endif 40 #endif /* not lint */ 41 #include <sys/cdefs.h> 42 __FBSDID("$FreeBSD$"); 43 44 /* 45 * lam - laminate files 46 * Author: John Kunze, UCB 47 */ 48 49 #include <sys/capsicum.h> 50 51 #include <capsicum_helpers.h> 52 #include <ctype.h> 53 #include <err.h> 54 #include <errno.h> 55 #include <stdio.h> 56 #include <stdlib.h> 57 #include <string.h> 58 #include <unistd.h> 59 60 #define MAXOFILES 20 61 #define BIGBUFSIZ 5 * BUFSIZ 62 63 static struct openfile { /* open file structure */ 64 FILE *fp; /* file pointer */ 65 short eof; /* eof flag */ 66 short pad; /* pad flag for missing columns */ 67 char eol; /* end of line character */ 68 const char *sepstring; /* string to print before each line */ 69 const char *format; /* printf(3) style string spec. */ 70 } input[MAXOFILES]; 71 72 static int morefiles; /* set by getargs(), changed by gatherline() */ 73 static int nofinalnl; /* normally append \n to each output line */ 74 static char line[BIGBUFSIZ]; 75 static char *linep; 76 77 static char *gatherline(struct openfile *); 78 static void getargs(char *[]); 79 static char *pad(struct openfile *); 80 static void usage(void); 81 82 int 83 main(int argc, char *argv[]) 84 { 85 struct openfile *ip; 86 87 if (argc == 1) 88 usage(); 89 if (caph_limit_stdio() == -1) 90 err(1, "unable to limit stdio"); 91 getargs(argv); 92 if (!morefiles) 93 usage(); 94 95 /* 96 * Cache NLS data, for strerror, for err(3), before entering capability 97 * mode. 98 */ 99 caph_cache_catpages(); 100 if (cap_enter() < 0 && errno != ENOSYS) 101 err(1, "unable to enter capability mode"); 102 103 for (;;) { 104 linep = line; 105 for (ip = input; ip->fp != NULL; ip++) 106 linep = gatherline(ip); 107 if (!morefiles) 108 exit(0); 109 fputs(line, stdout); 110 fputs(ip->sepstring, stdout); 111 if (!nofinalnl) 112 putchar('\n'); 113 } 114 } 115 116 static void 117 getargs(char *av[]) 118 { 119 struct openfile *ip = input; 120 char *p, *c; 121 static char fmtbuf[BUFSIZ]; 122 char *fmtp = fmtbuf; 123 int P, S, F, T; 124 cap_rights_t rights_ro; 125 126 cap_rights_init(&rights_ro, CAP_READ, CAP_FSTAT); 127 P = S = F = T = 0; /* capitalized options */ 128 while ((p = *++av) != NULL) { 129 if (*p != '-' || !p[1]) { 130 if (++morefiles >= MAXOFILES) 131 errx(1, "too many input files"); 132 if (*p == '-') 133 ip->fp = stdin; 134 else if ((ip->fp = fopen(p, "r")) == NULL) { 135 err(1, "%s", p); 136 } 137 if (cap_rights_limit(fileno(ip->fp), &rights_ro) < 0 138 && errno != ENOSYS) 139 err(1, "unable to limit rights on: %s", p); 140 ip->pad = P; 141 if (!ip->sepstring) 142 ip->sepstring = (S ? (ip-1)->sepstring : ""); 143 if (!ip->format) 144 ip->format = ((P || F) ? (ip-1)->format : "%s"); 145 if (!ip->eol) 146 ip->eol = (T ? (ip-1)->eol : '\n'); 147 ip++; 148 continue; 149 } 150 c = ++p; 151 switch (tolower((unsigned char)*c)) { 152 case 's': 153 if (*++p || (p = *++av)) 154 ip->sepstring = p; 155 else 156 usage(); 157 S = (*c == 'S' ? 1 : 0); 158 break; 159 case 't': 160 if (*++p || (p = *++av)) 161 ip->eol = *p; 162 else 163 usage(); 164 T = (*c == 'T' ? 1 : 0); 165 nofinalnl = 1; 166 break; 167 case 'p': 168 ip->pad = 1; 169 P = (*c == 'P' ? 1 : 0); 170 /* FALLTHROUGH */ 171 case 'f': 172 F = (*c == 'F' ? 1 : 0); 173 if (*++p || (p = *++av)) { 174 fmtp += strlen(fmtp) + 1; 175 if (fmtp >= fmtbuf + sizeof(fmtbuf)) 176 errx(1, "no more format space"); 177 /* restrict format string to only valid width formatters */ 178 if (strspn(p, "-.0123456789") != strlen(p)) 179 errx(1, "invalid format string `%s'", p); 180 if (snprintf(fmtp, fmtbuf + sizeof(fmtbuf) - fmtp, "%%%ss", p) 181 >= fmtbuf + sizeof(fmtbuf) - fmtp) 182 errx(1, "no more format space"); 183 ip->format = fmtp; 184 } 185 else 186 usage(); 187 break; 188 default: 189 usage(); 190 } 191 } 192 ip->fp = NULL; 193 if (!ip->sepstring) 194 ip->sepstring = ""; 195 } 196 197 static char * 198 pad(struct openfile *ip) 199 { 200 char *lp = linep; 201 202 strlcpy(lp, ip->sepstring, line + sizeof(line) - lp); 203 lp += strlen(lp); 204 if (ip->pad) { 205 snprintf(lp, line + sizeof(line) - lp, ip->format, ""); 206 lp += strlen(lp); 207 } 208 return (lp); 209 } 210 211 static char * 212 gatherline(struct openfile *ip) 213 { 214 char s[BUFSIZ]; 215 int c; 216 char *p; 217 char *lp = linep; 218 char *end = s + sizeof(s) - 1; 219 220 if (ip->eof) 221 return (pad(ip)); 222 for (p = s; (c = fgetc(ip->fp)) != EOF && p < end; p++) 223 if ((*p = c) == ip->eol) 224 break; 225 *p = '\0'; 226 if (c == EOF) { 227 ip->eof = 1; 228 if (ip->fp == stdin) 229 fclose(stdin); 230 morefiles--; 231 return (pad(ip)); 232 } 233 strlcpy(lp, ip->sepstring, line + sizeof(line) - lp); 234 lp += strlen(lp); 235 snprintf(lp, line + sizeof(line) - lp, ip->format, s); 236 lp += strlen(lp); 237 return (lp); 238 } 239 240 static void 241 usage(void) 242 { 243 fprintf(stderr, "%s\n%s\n", 244 "usage: lam [ -f min.max ] [ -s sepstring ] [ -t c ] file ...", 245 " lam [ -p min.max ] [ -s sepstring ] [ -t c ] file ..."); 246 exit(1); 247 } 248