237 lines
6.8 KiB
C
237 lines
6.8 KiB
C
/*
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* Copyright (c) 2024 DTB <trinity@trinity.moe>
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* SPDX-License-Identifier: AGPL-3.0-or-later
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*
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* This program is free software: you can redistribute it and/or modify it under
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* the terms of the GNU Affero General Public License as published by the Free
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* Software Foundation, either version 3 of the License, or (at your option) any
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* later version.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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* FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
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* details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see https://www.gnu.org/licenses/.
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*/
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#include <errno.h> /* errno */
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#include <signal.h> /* signal(2), SIG_ERR, SIG_IGN, SIGINT */
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#include <stdio.h> /* fclose(3), fopen(3), fprintf(3), getc(3), putc(3),
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* setvbuf(3), size_t, _IONBF, NULL */
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#include <stdlib.h> /* free(3), realloc(3) */
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#include <string.h> /* strcmp(3), strerror(3) */
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#include <unistd.h> /* getopt(3) */
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#if !defined EX_IOERR || !defined EX_OK || !defined EX_OSERR \
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|| !defined EX_USAGE
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# include <sysexits.h>
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#endif
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extern int errno;
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/* This structure is how open files are tracked. */
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struct Files{
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size_t a; /* allocation */
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size_t s; /* used size */
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char *mode; /* file opening mode */
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char **names; /* file names */
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FILE **files; /* file pointers */
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};
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/* How much to grow the allocation when it's saturated. */
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#ifndef ALLOC_INCREMENT
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# define ALLOC_INCREMENT 1
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#endif
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/* How much to grow the allocation at program start. */
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#ifndef ALLOC_INITIAL
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# define ALLOC_INITIAL 10
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#endif
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/* pre-allocated strings */
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static char *program_name = "<no argv[0]>";
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static char *stdin_name = "<stdin>";
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static char *stdout_name = "<stdout>";
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static char *stderr_name = "<stderr>";
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static char *(fmode[]) = { (char []){"rb"}, (char []){"rb+"} };
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static char *wharsh = "wb";
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/* Adds the open FILE pointer for the file at the path s to the files struct,
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* returning the FILE if successful and NULL if not, allocating more memory in
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* the files buffers as needed. */
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static FILE *
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Files_append(struct Files *files, FILE *file, char *name){
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if(file == NULL || (files->s == files->a
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&& ((files->files = realloc(files->files,
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(files->a += (files->a == 0)
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? ALLOC_INITIAL
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: ALLOC_INCREMENT)
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* sizeof *(files->files))) == NULL
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|| (files->names = realloc(files->names,
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files->a * sizeof *(files->names))) == NULL)))
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return NULL;
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files->names[files->s] = name;
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return files->files[files->s++] = file;
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}
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/* Opens the file at the path p and puts it in the files struct, returning NULL
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* if either the opening or the placement of the open FILE pointer fail. */
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#define Files_open(files, p) \
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Files_append((files), fopen((p), (files)->mode), (p))
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/* Prints a diagnostic message based on errno and returns an exit status
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* appropriate for an OS error. */
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static int
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oserr(char *s, char *r){
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fprintf(stderr, "%s: %s: %s\n", s, r, strerror(errno));
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return EX_OSERR;
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}
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/* Hijacks i and j from main and destructs the files[2] struct used by main by
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* closing its files and freeing its files and names arrays, returning retval
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* from main. */
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#define terminate \
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for(i = 0; i < 2; ++i){ \
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for(j = 0; j < files[i].s; ++j) \
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if(files[i].files[j] != stdin \
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&& files[i].files[j] != stdout \
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&& files[i].files[j] != stderr) \
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fclose(files[i].files[j]); \
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free(files[i].files); \
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free(files[i].names); \
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} \
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return retval
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/* Prints a usage text, in which s is the program being run (i.e. argv[0]), and
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* returns an exit status appropriate for a usage error. */
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int usage(char *s){
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fprintf(stderr, "Usage: %s (-aenu) (-i [input])... (-o [output])...\n", s);
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return EX_USAGE;
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}
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int main(int argc, char *argv[]){
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int c;
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struct Files files[2]; /* {read, write} */
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size_t i;
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size_t j;
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size_t k; /* loop index but also unbuffer status */
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int retval;
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/* Initializes the files structs with their default values, standard
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* input and standard output. If an input or an output is specified
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* these initial values will be overwritten, so to, say, use mm(1)
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* equivalently to tee(1p), -o - will need to be specified before
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* additional files to ensure standard output is still written. */
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for(i = 0; i < 2; ++i){
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files[i].a = 0;
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files[i].s = 0;
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files[i].mode = fmode[i];
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files[i].files = NULL;
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files[i].names = NULL;
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Files_append(&files[i], i == 0 ? stdin : stdout,
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i == 0 ? stdin_name : stdout_name);
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files[i].s = 0;
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}
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k = 0;
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if(argc > 0)
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program_name = argv[0];
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if(argc > 1)
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while((c = getopt(argc, argv, "aehi:no:u")) != -1)
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switch(c){
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case 'a': /* "rb+" -> "ab" */
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files[1].mode[0] = 'a';
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files[1].mode[2] = '\0';
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break;
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case 'e':
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if(Files_append(&files[1], stderr, stderr_name) != NULL)
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break;
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retval = oserr(argv[0], "-e");
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terminate;
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case 'i':
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if((strcmp(optarg, "-") == 0 && Files_append(&files[0],
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stdin, stdin_name) != NULL)
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|| Files_open(&files[0], optarg) != NULL)
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break;
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retval = oserr(argv[0], optarg);
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terminate;
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case 'o':
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if((strcmp(optarg, "-") == 0 && Files_append(&files[1],
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stdout, stdout_name) != NULL)
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|| Files_open(&files[1], optarg) != NULL)
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break;
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/* does not exist, so try to create it */
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if(errno == ENOENT){
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files[1].mode = wharsh;
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if(Files_open(&files[1], optarg) != NULL){
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files[1].mode = fmode[1];
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break;
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}
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}
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retval = oserr(argv[0], optarg);
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terminate;
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case 'n':
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if(signal(SIGINT, SIG_IGN) != SIG_ERR)
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break;
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retval = oserr(argv[0], "-n");
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terminate;
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case 'u':
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k = 1;
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break;
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default:
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retval = usage(argv[0]);
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terminate;
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}
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if(optind != argc){
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retval = usage(argv[0]);
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terminate;
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}
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files[0].s += files[0].s == 0;
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files[1].s += files[1].s == 0;
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/* Unbuffer files. */
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if(k){
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for(i = 0;
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i < files[0].s;
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setvbuf(files[0].files[i++], NULL, _IONBF, 0));
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for(i = 0;
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i < files[1].s;
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setvbuf(files[1].files[i++], NULL, _IONBF, 0));
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}
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retval = EX_OK;
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/* Actual program loop. */
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for(i = 0; i < files[0].s; ++i) /* iterate ins */
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while((c = getc(files[0].files[i])) != EOF) /* iterate chars */
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for(j = 0; j < files[1].s; ++j) /* iterate outs */
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if(putc(c, files[1].files[j]) == EOF){
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/* notebook's full */
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retval = EX_IOERR;
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fprintf(stderr, "%s: %s: %s\n",
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program_name, files[1].names[j], strerror(errno));
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if(fclose(files[1].files[j]) == EOF)
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fprintf(stderr, "%s: %s: %s\n",
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program_name, files[1].names[j], strerror(errno));
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/* massage out the tense muscle */
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for(k = j--; k < files[1].s - 1; ++k){
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files[1].files[k] = files[1].files[k+1];
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files[1].names[k] = files[1].names[k+1];
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}
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if(--files[1].s == 0)
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terminate;
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}
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terminate;
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}
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