ari/memory-allocator
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1 changed files with 63 additions and 169 deletions
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main.c
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@ -1,15 +1,8 @@
#include <stdio.h> #include <stdio.h>
#include <stdlib.h> #include <stdlib.h>
#include <math.h> #include <math.h>
#include <unistd.h>
#include <errno.h>
#include <ctype.h>
#include <string.h> #include <string.h>
#include <limits.h>
#define BYTES_GIVEN 1
#define FILENAME_GIVEN 2
#define SILENT 4
#define BYPASS_WARN 8
#define KiB (unsigned long long int) 0x400 #define KiB (unsigned long long int) 0x400
#define MiB (unsigned long long int) 0x100000 #define MiB (unsigned long long int) 0x100000
@ -18,131 +11,14 @@
#define LOADS TiB * 9999 #define LOADS TiB * 9999
void print_help(); char* get_shorthand(unsigned long long int size) {
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 <bytes> [-o <output file>] [-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) {
if (size < KiB) return 0; if (size < KiB) return 0;
if (size > LOADS) { if (size > LOADS) {
return ">9999 TiB"; return ">9999 TiB";
} }
unsigned char* buffer = malloc(sizeof(char) * 12); char* buffer = malloc(sizeof(char) * 12);
if (size >= TiB) { if (size >= TiB) {
snprintf(buffer, 12, "%.2f TiB", (float) 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; return 0;
} }
void adjust_by_denomination(unsigned long long int* size, char denomination) { unsigned long long int adjust_by_denomination(unsigned long long int size, char denomination) {
if (denomination >= 'a' && denomination <= 'z') denomination -= 32;
switch (denomination) { switch (denomination) {
case 'K': case 'K':
*size *= KiB; return size * KiB;
return;
case 'M': case 'M':
*size *= MiB; return size * MiB;
return;
case 'G': case 'G':
*size *= GiB; return size * GiB;
return;
case 'T': case 'T':
*size *= TiB; return size * TiB;
return; default:
return size;
} }
} }
unsigned long long int* allocate_heap(unsigned long long int size, char silent) { int main() {
if (!silent) {
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++;
}
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."); printf("please wait.");
fflush(stdout); fflush(stdout);
}
unsigned long long int* heap = (unsigned long long int*) malloc(size); 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++) { for (unsigned long long int i = 0; i < size / sizeof(long long int); i++) {
heap[i] = i; wtf[i] = ULLONG_MAX;
if (!silent && i > 0 && i % (1024 * 1024 * 1024 / sizeof(long long int)) == 0) { if (i > 0 && i % (1024 * 1024 * 1024 / sizeof(long long int)) == 0) {
printf("."); printf(".");
fflush(stdout); fflush(stdout);
} }
} }
if (!silent) printf("\n"); printf("\n");
return heap; 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");
void save_heap(unsigned long long int* heap, unsigned long long int size, char* filename, char silent) { getchar();
FILE* file = fopen(filename, "wb");
if (file == NULL) { free(wtf);
printf("failed to open %s!", filename);
exit(1); 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);
} }