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