diff options
Diffstat (limited to 'programs/lz4cli.c')
| -rw-r--r-- | programs/lz4cli.c | 37 |
1 files changed, 26 insertions, 11 deletions
diff --git a/programs/lz4cli.c b/programs/lz4cli.c index 8bd7042..82f2fac 100644 --- a/programs/lz4cli.c +++ b/programs/lz4cli.c @@ -652,7 +652,16 @@ int main(int argc, const char** argv) /* No output filename ==> try to select one automatically (when possible) */ while ((!output_filename) && (multiple_inputs==0)) { - if (!IS_CONSOLE(stdout)) { output_filename=stdoutmark; break; } /* Default to stdout whenever possible (i.e. not a console) */ + + if (!IS_CONSOLE(stdout)) { + /* Default to stdout whenever stdout is not the console. + * Note : this policy may change in the future, therefore don't rely on it ! + * To ensure `stdout` is explicitly selected, use `-c` command flag. + * Conversely, to ensure output will not become `stdout`, use `-m` command flag */ + DISPLAYLEVEL(1, "Warning : using stdout as default output. Do not rely on this behavior: use explicit `-c` instead ! \n"); + output_filename=stdoutmark; + break; + } if (mode == om_auto) { /* auto-determine compression or decompression, based on file extension */ mode = determineOpMode(input_filename); } @@ -682,10 +691,14 @@ int main(int argc, const char** argv) break; } - /* Check if output is defined as console; trigger an error in this case */ + if (multiple_inputs==0) assert(output_filename); + /* when multiple_inputs==1, output_filename may simply be useless, + * however, output_filename must be !NULL for next strcmp() tests */ if (!output_filename) output_filename = "*\\dummy^!//"; + + /* Check if output is defined as console; trigger an error in this case */ if (!strcmp(output_filename,stdoutmark) && IS_CONSOLE(stdout) && !forceStdout) { - DISPLAYLEVEL(1, "refusing to write to console without -c\n"); + DISPLAYLEVEL(1, "refusing to write to console without -c \n"); exit(1); } /* Downgrade notification level in stdout and multiple file mode */ @@ -701,21 +714,23 @@ int main(int argc, const char** argv) LZ4IO_setNotificationLevel((int)displayLevel); if (ifnIdx == 0) multiple_inputs = 0; if (mode == om_decompress) { - if (multiple_inputs) - operationResult = LZ4IO_decompressMultipleFilenames(prefs, inFileNames, ifnIdx, !strcmp(output_filename,stdoutmark) ? stdoutmark : LZ4_EXTENSION); - else + if (multiple_inputs) { + assert(ifnIdx <= INT_MAX); + operationResult = LZ4IO_decompressMultipleFilenames(prefs, inFileNames, (int)ifnIdx, !strcmp(output_filename,stdoutmark) ? stdoutmark : LZ4_EXTENSION); + } else { operationResult = DEFAULT_DECOMPRESSOR(prefs, input_filename, output_filename); + } } else { /* compression is default action */ if (legacy_format) { DISPLAYLEVEL(3, "! Generating LZ4 Legacy format (deprecated) ! \n"); LZ4IO_compressFilename_Legacy(prefs, input_filename, output_filename, cLevel); } else { - if (multiple_inputs) - operationResult = LZ4IO_compressMultipleFilenames(prefs, inFileNames, ifnIdx, !strcmp(output_filename,stdoutmark) ? stdoutmark : LZ4_EXTENSION, cLevel); - else + if (multiple_inputs) { + assert(ifnIdx <= INT_MAX); + operationResult = LZ4IO_compressMultipleFilenames(prefs, inFileNames, (int)ifnIdx, !strcmp(output_filename,stdoutmark) ? stdoutmark : LZ4_EXTENSION, cLevel); + } else { operationResult = DEFAULT_COMPRESSOR(prefs, input_filename, output_filename, cLevel); - } - } + } } } _cleanup: if (main_pause) waitEnter(); |