/* $NetBSD: vis.c,v 1.25 2015/05/24 19:42:39 christos Exp $ */ /*- * Copyright (c) 1989, 1993 * The Regents of the University of California. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #include <sys/cdefs.h> #ifndef lint __COPYRIGHT("@(#) Copyright (c) 1989, 1993\ The Regents of the University of California. All rights reserved."); #endif /* not lint */ #ifndef lint #if 0 static char sccsid[] = "@(#)vis.c 8.1 (Berkeley) 6/6/93"; #endif __RCSID("$NetBSD: vis.c,v 1.25 2015/05/24 19:42:39 christos Exp $"); #endif /* not lint */ #include <stdio.h> #include <string.h> #include <stdlib.h> #include <string.h> #include <errno.h> #include <wchar.h> #include <limits.h> #include <unistd.h> #include <err.h> #include <vis.h> #include "extern.h" static int eflags, fold, foldwidth = 80, none, markeol; #ifdef DEBUG int debug; #endif static const char *extra = ""; static void process(FILE *); int main(int argc, char *argv[]) { FILE *fp; int ch; int rval; while ((ch = getopt(argc, argv, "bcde:F:fhlMmNnoSstw")) != -1) switch((char)ch) { case 'b': eflags |= VIS_NOSLASH; break; case 'c': eflags |= VIS_CSTYLE; break; #ifdef DEBUG case 'd': debug++; break; #endif case 'e': extra = optarg; break; case 'F': if ((foldwidth = atoi(optarg)) < 5) { errx(1, "can't fold lines to less than 5 cols"); /* NOTREACHED */ } markeol++; break; case 'f': fold++; /* fold output lines to 80 cols */ break; /* using hidden newline */ case 'h': eflags |= VIS_HTTPSTYLE; break; case 'l': markeol++; /* mark end of line with \$ */ break; case 'M': eflags |= VIS_META; break; case 'm': eflags |= VIS_MIMESTYLE; if (foldwidth == 80) foldwidth = 76; break; case 'N': eflags |= VIS_NOLOCALE; break; case 'n': none++; break; case 'o': eflags |= VIS_OCTAL; break; case 'S': eflags |= VIS_SHELL; break; case 's': eflags |= VIS_SAFE; break; case 't': eflags |= VIS_TAB; break; case 'w': eflags |= VIS_WHITE; break; case '?': default: (void)fprintf(stderr, "Usage: %s [-bcfhlMmNnoSstw] [-e extra]" " [-F foldwidth] [file ...]\n", getprogname()); return 1; } if ((eflags & (VIS_HTTPSTYLE|VIS_MIMESTYLE)) == (VIS_HTTPSTYLE|VIS_MIMESTYLE)) errx(1, "Can't specify -m and -h at the same time"); argc -= optind; argv += optind; rval = 0; if (*argv) while (*argv) { if ((fp = fopen(*argv, "r")) != NULL) { process(fp); (void)fclose(fp); } else { warn("%s", *argv); rval = 1; } argv++; } else process(stdin); return rval; } static void process(FILE *fp) { static int col = 0; static char nul[] = "\0"; char *cp = nul + 1; /* so *(cp-1) starts out != '\n' */ wint_t c, c1, rachar; char mbibuff[2 * MB_LEN_MAX + 1]; /* max space for 2 wchars */ char buff[4 * MB_LEN_MAX + 1]; /* max encoding length for one char */ int mbilen, cerr = 0, raerr = 0; /* * The input stream is considered to be multibyte characters. * The input loop will read this data inputing one character, * possibly multiple bytes, at a time and converting each to * a wide character wchar_t. * * The vis(3) functions, however, require single either bytes * or a multibyte string as their arguments. So we convert * our input wchar_t and the following look-ahead wchar_t to * a multibyte string for processing by vis(3). */ /* Read one multibyte character, store as wchar_t */ c = getwc(fp); if (c == WEOF && errno == EILSEQ) { /* Error in multibyte data. Read one byte. */ c = (wint_t)getc(fp); cerr = 1; } while (c != WEOF) { /* Clear multibyte input buffer. */ memset(mbibuff, 0, sizeof(mbibuff)); /* Read-ahead next multibyte character. */ if (!cerr) rachar = getwc(fp); if (cerr || (rachar == WEOF && errno == EILSEQ)) { /* Error in multibyte data. Read one byte. */ rachar = (wint_t)getc(fp); raerr = 1; } if (none) { /* Handle -n flag. */ cp = buff; *cp++ = c; if (c == '\\') *cp++ = '\\'; *cp = '\0'; } else if (markeol && c == '\n') { /* Handle -l flag. */ cp = buff; if ((eflags & VIS_NOSLASH) == 0) *cp++ = '\\'; *cp++ = '$'; *cp++ = '\n'; *cp = '\0'; } else { /* * Convert character using vis(3) library. * At this point we will process one character. * But we must pass the vis(3) library this * character plus the next one because the next * one is used as a look-ahead to decide how to * encode this one under certain circumstances. * * Since our characters may be multibyte, e.g., * in the UTF-8 locale, we cannot use vis() and * svis() which require byte input, so we must * create a multibyte string and use strvisx(). */ /* Treat EOF as a NUL char. */ c1 = rachar; if (c1 == WEOF) c1 = L'\0'; /* * If we hit a multibyte conversion error above, * insert byte directly into string buff because * wctomb() will fail. Else convert wchar_t to * multibyte using wctomb(). */ if (cerr) { *mbibuff = (char)c; mbilen = 1; } else mbilen = wctomb(mbibuff, c); /* Same for look-ahead character. */ if (raerr) mbibuff[mbilen] = (char)c1; else wctomb(mbibuff + mbilen, c1); /* Perform encoding on just first character. */ (void) strsenvisx(buff, 4 * MB_LEN_MAX, mbibuff, 1, eflags, extra, &cerr); } cp = buff; if (fold) { #ifdef DEBUG if (debug) (void)printf("<%02d,", col); #endif col = foldit(cp, col, foldwidth, eflags); #ifdef DEBUG if (debug) (void)printf("%02d>", col); #endif } do { (void)putchar(*cp); } while (*++cp); c = rachar; cerr = raerr; } /* * terminate partial line with a hidden newline */ if (fold && *(cp - 1) != '\n') (void)printf(eflags & VIS_MIMESTYLE ? "=\n" : "\\\n"); }
