diff --git a/main.c b/main.c index c6c3801..90f3eb0 100644 --- a/main.c +++ b/main.c @@ -1,15 +1,8 @@ #include #include #include -#include -#include -#include #include - -#define BYTES_GIVEN 1 -#define FILENAME_GIVEN 2 -#define SILENT 4 -#define BYPASS_WARN 8 +#include #define KiB (unsigned long long int) 0x400 #define MiB (unsigned long long int) 0x100000 @@ -18,131 +11,14 @@ #define LOADS TiB * 9999 -void print_help(); -unsigned char* get_shorthand(unsigned long long int size); -void adjust_by_denomination(unsigned long long int* size, char denomination); -unsigned long long int* allocate_heap(unsigned long long int size, char silent); -void save_heap(unsigned long long int* heap, unsigned long long int size, char* filename, char silent); - -int main(int argc, char* argv[]) { - - unsigned char flags = 0; - unsigned long long int size = 0; - unsigned 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 |= FILENAME_GIVEN; - 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", optopt); - print_help(); - exit(1); - } - - adjust_by_denomination(&size, denominator); - - // even if the user doesn't specify a denomination, it still would be nice to display a truncated amount if available. - unsigned 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'); - } - - unsigned char input = getchar(); - if (input != 'y') exit(0); - while (getchar() != '\n'); - } - - unsigned long long int* heap = allocate_heap(size, flags & SILENT); - - 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); - exit(0); - } - - if (filename != NULL) save_heap(heap, size, filename, SILENT); - - if (!(flags & SILENT)) printf("done!\n"); - - 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); -} - -unsigned char* get_shorthand(unsigned long long int size) { +char* get_shorthand(unsigned long long int size) { if (size < KiB) return 0; if (size > LOADS) { return ">9999 TiB"; } - unsigned char* buffer = malloc(sizeof(char) * 12); + char* buffer = malloc(sizeof(char) * 12); if (size >= TiB) { snprintf(buffer, 12, "%.2f TiB", (float) size / TiB); @@ -164,65 +40,83 @@ unsigned char* get_shorthand(unsigned long long int size) { return 0; } -void adjust_by_denomination(unsigned long long int* size, char denomination) { - if (denomination >= 'a' && denomination <= 'z') denomination -= 32; +unsigned long long int adjust_by_denomination(unsigned long long int size, char denomination) { switch (denomination) { case 'K': - *size *= KiB; - return; + return size * KiB; case 'M': - *size *= MiB; - return; + return size * MiB; case 'G': - *size *= GiB; - return; + return size * GiB; case 'T': - *size *= TiB; - return; + return size * TiB; + default: + return size; } } -unsigned long long int* allocate_heap(unsigned long long int size, char silent) { - if (!silent) { - printf("please wait."); - fflush(stdout); +int main() { + + unsigned long long int size = 0; + + printf("please enter the amount of memory you would like to allocate (\"1G\" = 1 GiB = 1073741824 bytes):\n> "); + unsigned int digit = 0; + unsigned char last_char = 0; + while (1) { + unsigned char input = getchar(); + if (input == '\n') break; + if (input >= 'a' && input <= 'z') input -= 32; + last_char = input; + + if (input < '0' || input > '9') continue; + + if (digit > 0) size *= 10; + + size += (unsigned int) input - 48; + digit++; } - unsigned long long int* heap = (unsigned long long int*) malloc(size); + size = adjust_by_denomination(size, last_char); + + // 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 (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'); + } + + unsigned char input = getchar(); + if (input != 'y') return 0; + while (getchar() != '\n'); + + printf("please wait."); + fflush(stdout); + + unsigned long long int* wtf = (unsigned long long int*) malloc(size); for (unsigned long long int i = 0; i < size / sizeof(long long int); i++) { - heap[i] = i; - if (!silent && i > 0 && i % (1024 * 1024 * 1024 / sizeof(long long int)) == 0) { + wtf[i] = ULLONG_MAX; + if (i > 0 && i % (1024 * 1024 * 1024 / sizeof(long long int)) == 0) { printf("."); fflush(stdout); } } - if (!silent) printf("\n"); + printf("\n"); - 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); + 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(wtf); + + return 0; - if (!silent) printf("please wait...\n"); - /* - for (unsigned long long int i = 0; i < size / sizeof(unsigned long long int); i++) { - for (int p = 0; p < 8; p++) { - fputc(*(&heap[i] + p), file); - } - if (i > 0 && i % (1024 * 1024 * 1024 / sizeof(long long int)) == 0) { - if (!silent) printf("."); - fflush(stdout); - } - } - if (!silent) printf("\n"); - */ - fwrite(heap, sizeof(char), size, file); - fputs("\n", file); - fclose(file); }