diff --git a/main.c b/main.c index ddf88ea..fb886b6 100644 --- a/main.c +++ b/main.c @@ -25,187 +25,187 @@ void save_heap(unsigned long long int* heap, unsigned long long int size, char* int main(int argc, char* argv[]) { - unsigned char flags = 0; - unsigned long long int size = 0; - char* filename = NULL; - unsigned char denominator = 0; + unsigned char flags = 0; + unsigned long long int size = 0; + char* filename = NULL; + unsigned char denominator = 0; - int arg; - while ((arg = getopt(argc, argv, "hb:o:sw")) != -1) { - switch (arg) { - case 'h': - print_help(); - exit(0); - case 'b': - size = strtoull(optarg, NULL, 10); - if (errno == EINVAL) { - fprintf(stderr, "argument -b used with invalid value '%s'!\n", optarg); - exit(0); - } - if (errno == ERANGE) { - fprintf(stderr, "byte argument ''%s' out of range!\n", optarg); - exit(0); - } - denominator = optarg[strlen(optarg) - 1]; - flags |= BYTES_GIVEN; - break; - case 'o': - filename = optarg; - flags |= OUTPUT_FILE; - break; - case 's': - if (size == 0 || filename == NULL) { - fprintf(stderr, "cannot run silently without -b and -o set!\n"); - print_help(); - } - flags |= SILENT; - break; - case 'w': - flags |= BYPASS_WARN; - break; - case '?': - if (optopt == 'b' || optopt == 'o') - fprintf(stderr, "argument -%c requires an argument!\n", optopt); - else if (isprint(optopt)) - fprintf(stderr, "unknown argument '-%c'.\n", optopt); - else - fprintf(stderr, "unknown argument character '\\x%x'.\n", optopt); - exit(1); - default: - exit(1); - } - } - - if (!(flags & BYTES_GIVEN)) { - fprintf(stderr, "argument -b is required!\n"); + int arg; + while ((arg = getopt(argc, argv, "hb:o:sw")) != -1) { + switch (arg) { + case 'h': print_help(); + exit(0); + case 'b': + size = strtoull(optarg, NULL, 10); + if (errno == EINVAL) { + fprintf(stderr, "argument -b used with invalid value '%s'!\n", optarg); + exit(0); + } + if (errno == ERANGE) { + fprintf(stderr, "byte argument ''%s' out of range!\n", optarg); + exit(0); + } + denominator = optarg[strlen(optarg) - 1]; + flags |= BYTES_GIVEN; + break; + case 'o': + filename = optarg; + flags |= OUTPUT_FILE; + break; + case 's': + if (size == 0 || filename == NULL) { + fprintf(stderr, "cannot run silently without -b and -o set!\n"); + print_help(); + } + flags |= SILENT; + break; + case 'w': + flags |= BYPASS_WARN; + break; + case '?': + if (optopt == 'b' || optopt == 'o') + fprintf(stderr, "argument -%c requires an argument!\n", optopt); + else if (isprint(optopt)) + fprintf(stderr, "unknown argument '-%c'.\n", optopt); + else + fprintf(stderr, "unknown argument character '\\x%x'.\n", optopt); + exit(1); + default: exit(1); } + } - adjust_by_denomination(&size, denominator); + if (!(flags & BYTES_GIVEN)) { + fprintf(stderr, "argument -b is required!\n"); + print_help(); + exit(1); + } - // even if the user doesn't specify a denomination, it still would be nice to display a truncated amount if available. - char* shorthand = get_shorthand(size); - if (!(flags & SILENT) && !(flags & BYPASS_WARN)) { - if (shorthand) { - printf("you are about to allocate %s (%llu bytes) of heap memory. are you sure? (y/N)\n> ", shorthand, size); - } else { - printf("you are about to allocate %llu byte%c of heap memory. are you sure? (y/N)\n> ", size, size == 1 ? 0 : 's'); - } + adjust_by_denomination(&size, denominator); - unsigned char input = getchar(); - if (input != 'y') exit(0); - while (getchar() != '\n'); + // even if the user doesn't specify a denomination, it still would be nice to display a truncated amount if available. + char* shorthand = get_shorthand(size); + if (!(flags & SILENT) && !(flags & BYPASS_WARN)) { + if (shorthand) { + printf("you are about to allocate %s (%llu bytes) of heap memory. are you sure? (y/N)\n> ", shorthand, size); + } else { + printf("you are about to allocate %llu byte%c of heap memory. are you sure? (y/N)\n> ", size, size == 1 ? 0 : 's'); } - void* heap = allocate_heap(size, flags & SILENT); - if (filename != NULL) save_heap(heap, size, filename, flags & SILENT); + unsigned char input = getchar(); + if (input != 'y') exit(0); + while (getchar() != '\n'); + } - if (!(flags & SILENT)) { - if (shorthand) { - printf("%s (%llu bytes) of heap memory has been allocated. you are insane.\n", shorthand, size); - } else { - printf("%llu byte%c of heap memory ha%s been allocated. you are insane.\n", size, size == 1 ? 0 : 's', size == 1 ? "s" : "ve"); - } - free(shorthand); + void* heap = allocate_heap(size, flags & SILENT); + if (filename != NULL) save_heap(heap, size, filename, flags & SILENT); - printf("press ENTER to release this memory, or CTRL+C to exit the program.\n"); - getchar(); - free(heap); - exit(0); + if (!(flags & SILENT)) { + if (shorthand) { + printf("%s (%llu bytes) of heap memory has been allocated. you are insane.\n", shorthand, size); + } else { + printf("%llu byte%c of heap memory ha%s been allocated. you are insane.\n", size, size == 1 ? 0 : 's', size == 1 ? "s" : "ve"); } + free(shorthand); + printf("press ENTER to release this memory, or CTRL+C to exit the program.\n"); + getchar(); free(heap); - return 0; + exit(0); + } + + free(heap); + return 0; } void print_help() { - printf("usage: allocatememory -b [-o ] [-s]\n\n"); - printf("OPTIONS\n"); - printf(" -h\tdisplays help\n"); - printf(" -b\tnumber of bytes to allocate (e.g. 1024, 1g, 64K)\n"); - printf(" -o\tfile to output to\n"); - printf(" -s\trun silently (requires -b and -o)\n"); - printf(" -w\tdisable warnings (\"i know what i'm doing!\")\n"); - exit(0); + printf("usage: allocatememory -b [-o ] [-s]\n\n"); + printf("OPTIONS\n"); + printf(" -h\tdisplays help\n"); + printf(" -b\tnumber of bytes to allocate (e.g. 1024, 1g, 64K)\n"); + printf(" -o\tfile to output to\n"); + printf(" -s\trun silently (requires -b and -o)\n"); + printf(" -w\tdisable warnings (\"i know what i'm doing!\")\n"); + exit(0); } char* get_shorthand(unsigned long long int size) { - if (size < KiB) return 0; + if (size < KiB) return 0; - if (size > LOADS) { - return ">9999 TiB"; - } + if (size > LOADS) { + return ">9999 TiB"; + } - char* buffer = malloc(sizeof(char) * 12); + char* buffer = malloc(sizeof(char) * 12); - if (size >= TiB) { - snprintf(buffer, 12, "%.2f TiB", (float) size / TiB); - return buffer; - } - if (size >= GiB) { - snprintf(buffer, 12, "%.2f GiB", (float) size / GiB); - return buffer; - } - if (size >= MiB) { - snprintf(buffer, 12, "%.2f MiB", (float) size / MiB); - return buffer; - } - if (size >= KiB) { - snprintf(buffer, 12, "%.2f KiB", (float) size / KiB); - return buffer; - } + if (size >= TiB) { + snprintf(buffer, 12, "%.2f TiB", (float) size / TiB); + return buffer; + } + if (size >= GiB) { + snprintf(buffer, 12, "%.2f GiB", (float) size / GiB); + return buffer; + } + if (size >= MiB) { + snprintf(buffer, 12, "%.2f MiB", (float) size / MiB); + return buffer; + } + if (size >= KiB) { + snprintf(buffer, 12, "%.2f KiB", (float) size / KiB); + return buffer; + } - return 0; + return 0; } void adjust_by_denomination(unsigned long long int* size, char denomination) { - if (denomination >= 'a' && denomination <= 'z') denomination -= 32; - switch (denomination) { - case 'K': - *size *= KiB; - return; - case 'M': - *size *= MiB; - return; - case 'G': - *size *= GiB; - return; - case 'T': - *size *= TiB; - return; - } + if (denomination >= 'a' && denomination <= 'z') denomination -= 32; + switch (denomination) { + case 'K': + *size *= KiB; + return; + case 'M': + *size *= MiB; + return; + case 'G': + *size *= GiB; + return; + case 'T': + *size *= TiB; + return; + } } void* allocate_heap(unsigned long long int size, char silent) { - if (!silent) { - printf("please wait."); - fflush(stdout); + if (!silent) { + printf("please wait."); + fflush(stdout); + } + + unsigned long long int* heap = (unsigned long long int*) malloc(size); + + for (unsigned long long int i = 0; i < size / sizeof(long long int); i++) { + heap[i] = ((unsigned long long int)rand() << 32) + (unsigned long long int)rand(); + + if (!silent && i > 0 && i % (1024 * 1024 * 1024 / sizeof(long long int)) == 0) { + printf("."); + fflush(stdout); } + } + if (!silent) printf("\n"); - unsigned long long int* heap = (unsigned long long int*) malloc(size); - - for (unsigned long long int i = 0; i < size / sizeof(long long int); i++) { - heap[i] = ((unsigned long long int)rand() << 32) + (unsigned long long int)rand(); - - if (!silent && i > 0 && i % (1024 * 1024 * 1024 / sizeof(long long int)) == 0) { - printf("."); - fflush(stdout); - } - } - if (!silent) printf("\n"); - - return heap; + return heap; } void save_heap(unsigned long long int* heap, unsigned long long int size, char* filename, char silent) { - FILE* file = fopen(filename, "wb"); - if (file == NULL) { - printf("failed to open %s!", filename); - exit(1); - } - fwrite(heap, sizeof(char), size, file); - fputs("\n", file); - fclose(file); + FILE* file = fopen(filename, "wb"); + if (file == NULL) { + printf("failed to open %s!", filename); + exit(1); + } + fwrite(heap, sizeof(char), size, file); + fputs("\n", file); + fclose(file); }