diff options
Diffstat (limited to 'usr.bin/cmp/special.c')
| -rw-r--r-- | usr.bin/cmp/special.c | 126 |
1 files changed, 126 insertions, 0 deletions
diff --git a/usr.bin/cmp/special.c b/usr.bin/cmp/special.c new file mode 100644 index 000000000000..e25e82b17047 --- /dev/null +++ b/usr.bin/cmp/special.c @@ -0,0 +1,126 @@ +/*- + * SPDX-License-Identifier: BSD-3-Clause + * + * Copyright (c) 1991, 1993, 1994 + * 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/types.h> + +#include <capsicum_helpers.h> +#include <err.h> +#include <stdbool.h> +#include <stdlib.h> +#include <stdio.h> + +#include "extern.h" + +int +c_special(int fd1, const char *file1, off_t skip1, + int fd2, const char *file2, off_t skip2, off_t limit) +{ + int ch1, ch2; + off_t byte, line; + FILE *fp1, *fp2; + int dfound; + + if (caph_limit_stream(fd1, CAPH_READ) < 0) + err(ERR_EXIT, "caph_limit_stream(%s)", file1); + if (caph_limit_stream(fd2, CAPH_READ) < 0) + err(ERR_EXIT, "caph_limit_stream(%s)", file2); + if (caph_enter() < 0) + err(ERR_EXIT, "unable to enter capability mode"); + + if ((fp1 = fdopen(fd1, "r")) == NULL) + err(ERR_EXIT, "%s", file1); + (void)setvbuf(fp1, NULL, _IOFBF, 65536); + if ((fp2 = fdopen(fd2, "r")) == NULL) + err(ERR_EXIT, "%s", file2); + (void)setvbuf(fp2, NULL, _IOFBF, 65536); + + dfound = 0; + while (skip1--) + if (getc(fp1) == EOF) + goto eof; + while (skip2--) + if (getc(fp2) == EOF) + goto eof; + + for (byte = line = 1; limit == 0 || byte <= limit; ++byte) { +#ifdef SIGINFO + if (info) { + (void)fprintf(stderr, "%s %s char %zu line %zu\n", + file1, file2, (size_t)byte, (size_t)line); + info = 0; + } +#endif + ch1 = getc(fp1); + ch2 = getc(fp2); + if (ch1 == EOF || ch2 == EOF) + break; + if (ch1 != ch2) { + if (xflag) { + dfound = 1; + (void)printf("%08llx %02x %02x\n", + (long long)byte - 1, ch1, ch2); + } else if (lflag) { + dfound = 1; + if (bflag) + (void)printf("%6lld %3o %c %3o %c\n", + (long long)byte, ch1, ch1, ch2, + ch2); + else + (void)printf("%6lld %3o %3o\n", + (long long)byte, ch1, ch2); + } else { + diffmsg(file1, file2, byte, line, ch1, ch2); + return (DIFF_EXIT); + } + } + if (ch1 == '\n') + ++line; + } + +eof: if (ferror(fp1)) + err(ERR_EXIT, "%s", file1); + if (ferror(fp2)) + err(ERR_EXIT, "%s", file2); + if (feof(fp1)) { + if (!feof(fp2)) { + eofmsg(file1); + return (DIFF_EXIT); + } + } else { + if (feof(fp2)) { + eofmsg(file2); + return (DIFF_EXIT); + } + } + fclose(fp2); + fclose(fp1); + return (dfound ? DIFF_EXIT : 0); +} |