File: tcatl.c 1 /* 2 The MIT License (MIT) 3 4 Copyright © 2020-2025 pacman64 5 6 Permission is hereby granted, free of charge, to any person obtaining a copy of 7 this software and associated documentation files (the “Software”), to deal 8 in the Software without restriction, including without limitation the rights to 9 use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies 10 of the Software, and to permit persons to whom the Software is furnished to do 11 so, subject to the following conditions: 12 13 The above copyright notice and this permission notice shall be included in all 14 copies or substantial portions of the Software. 15 16 THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 17 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 18 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 19 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 20 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 21 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 22 SOFTWARE. 23 */ 24 25 /* 26 You can build this command-line app by running 27 28 cc -Wall -s -O3 -march=native -mtune=native -flto -o ./tcatl ./tcatl.c 29 */ 30 31 #include <stdbool.h> 32 #include <stdio.h> 33 #include <stdlib.h> 34 #include <string.h> 35 #include <unistd.h> 36 37 #ifdef _WIN32 38 #include <fcntl.h> 39 #include <windows.h> 40 #endif 41 42 #ifdef RED_ERRORS 43 #define ERROR_STYLE "\x1b[38;2;204;0;0m" 44 #ifdef __APPLE__ 45 #define ERROR_STYLE "\x1b[31m" 46 #endif 47 #define RESET_STYLE "\x1b[0m" 48 #else 49 #define ERROR_STYLE 50 #define RESET_STYLE 51 #endif 52 53 #define ERROR_LINE(MSG) (ERROR_STYLE MSG RESET_STYLE "\n") 54 55 #define BAD_ALLOC 2 56 57 #ifndef IBUF_SIZE 58 #define IBUF_SIZE (32 * 1024) 59 #endif 60 61 const char* info = "" 62 "tcatl [filenames...]\n" 63 "\n" 64 "Title and Concatenate lines emits lines from all the named sources given,\n" 65 "preceding each file's contents with its name, using an ANSI reverse style.\n" 66 "\n" 67 "The name `-` stands for the standard input. When no names are given, the\n" 68 "standard input is used by default.\n" 69 ""; 70 71 // slice is a growable region of bytes in memory 72 typedef struct slice { 73 // ptr is the starting place of the region 74 unsigned char* ptr; 75 76 // cap is how many bytes the memory region has available 77 size_t cap; 78 } slice; 79 80 void handle_reader_faster(FILE* w, FILE* r) { 81 unsigned char buf[IBUF_SIZE]; 82 unsigned char last = '\n'; 83 84 while (!feof(w)) { 85 size_t len = fread(buf, sizeof(buf[0]), sizeof(buf), r); 86 if (len < 1) { 87 break; 88 } 89 90 fwrite(buf, 1, len, w); 91 last = buf[len - 1]; 92 } 93 94 if (last != '\n') { 95 fputc('\n', w); 96 } 97 } 98 99 void handle_reader(FILE* w, FILE* r, slice* line, bool live_lines) { 100 if (!live_lines) { 101 handle_reader_faster(w, r); 102 return; 103 } 104 105 while (!feof(w)) { 106 ssize_t len = getline((char**)&line->ptr, &line->cap, r); 107 if (line->ptr == NULL) { 108 fprintf(stderr, "\n"); 109 fprintf(stderr, ERROR_LINE("out of memory")); 110 exit(BAD_ALLOC); 111 } 112 113 if (len < 0) { 114 break; 115 } 116 117 fwrite(line->ptr, 1, len, w); 118 const bool has_lf = len >= 1 && line->ptr[len - 1] == '\n'; 119 if (!has_lf) { 120 fputc('\n', w); 121 } 122 fflush(w); 123 } 124 } 125 126 // handle_file handles data from the filename given; returns false only when 127 // the file can't be opened 128 bool handle_file(FILE* w, const char* path, slice* line, bool live_lines) { 129 fprintf(w, "\x1b[7m%s\x1b[0m\n", path); 130 131 FILE* f = fopen(path, "rb"); 132 if (f == NULL) { 133 fprintf(stderr, ERROR_LINE("can't open file named '%s'"), path); 134 return false; 135 } 136 137 handle_reader(w, f, line, live_lines); 138 fclose(f); 139 return true; 140 } 141 142 // run returns the number of errors 143 int run(char** args, size_t nargs, FILE* w, bool live_lines) { 144 size_t dashes = 0; 145 for (size_t i = 0; i < nargs; i++) { 146 if (args[i][0] == '-' && args[i][1] == 0) { 147 dashes++; 148 } 149 } 150 151 if (dashes > 1) { 152 const char* m = "can't use the standard input (dash) more than once"; 153 fprintf(stderr, ERROR_LINE("%s"), m); 154 return 1; 155 } 156 157 slice line; 158 line.ptr = NULL; 159 line.cap = 0; 160 161 if (live_lines) { 162 line.cap = 32 * 1024; 163 line.ptr = malloc(line.cap); 164 if (line.ptr == NULL) { 165 fprintf(stderr, ERROR_LINE("out of memory")); 166 exit(BAD_ALLOC); 167 } 168 } 169 170 size_t errors = 0; 171 for (size_t i = 0; i < nargs && !feof(w); i++) { 172 if (args[i][0] == '-' && args[i][1] == 0) { 173 fputs("\x1b[7m-\x1b[0m\n", w); 174 handle_reader(w, stdin, &line, live_lines); 175 continue; 176 } 177 178 if (!handle_file(w, args[i], &line, live_lines)) { 179 errors++; 180 } 181 } 182 183 // use stdin when not given any filepaths 184 if (nargs < 1) { 185 fputs("\x1b[7m-\x1b[0m\n", w); 186 handle_reader(w, stdin, &line, live_lines); 187 } 188 189 free(line.ptr); 190 return errors; 191 } 192 193 int main(int argc, char** argv) { 194 #ifdef _WIN32 195 setmode(fileno(stdin), O_BINARY); 196 // ensure output lines end in LF instead of CRLF on windows 197 setmode(fileno(stdout), O_BINARY); 198 setmode(fileno(stderr), O_BINARY); 199 #endif 200 201 if (argc > 1) { 202 if ( 203 strcmp(argv[1], "-h") == 0 || 204 strcmp(argv[1], "-help") == 0 || 205 strcmp(argv[1], "--h") == 0 || 206 strcmp(argv[1], "--help") == 0 207 ) { 208 fprintf(stdout, "%s", info); 209 return 0; 210 } 211 } 212 213 size_t nargs = argc - 1; 214 char** args = argv + 1; 215 if (nargs > 0 && strcmp(args[0], "--") == 0) { 216 nargs--; 217 args++; 218 } 219 220 const bool live_lines = lseek(fileno(stdout), 0, SEEK_CUR) != 0; 221 if (!live_lines) { 222 setvbuf(stdout, NULL, _IOFBF, 0); 223 } 224 return run(args, nargs, stdout, live_lines) == 0 ? 0 : 1; 225 }