98 lines
1.5 KiB
C
98 lines
1.5 KiB
C
#include <stdlib.h>
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#include <stdio.h>
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#include <stdint.h>
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#include "dbg.h"
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#include "util.h"
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#ifdef POSIX
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#include <fcntl.h>
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#include <sys/mman.h>
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#include <unistd.h>
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#endif
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// print message to stderr and then exit
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void die(const char* s) {
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fprintf(stderr, "FATAL ERROR: %s.\n", s);
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exit(1);
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}
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// print perror message to stderr and then exit
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void diePerror(const char* s) {
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perror(s);
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exit(1);
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}
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// malloc which dies on failure
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void* xmalloc(size_t bytes) {
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void* p = malloc(bytes);
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GUARD(p);
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return p;
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}
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// realloc which dies on failure
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void* xrealloc(void* p, size_t bytes) {
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p = realloc(p, bytes);
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GUARD(p);
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return p;
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}
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// free which is garantueed null pointer safe
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void xfree(void* p) {
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if (p) {
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free(p);
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}
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}
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// read the file at the given path and return a byte buffer
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// pointing to the contents of the file, the length of which
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// is stored in rsize
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uint8_t* readFile(char* path, size_t* rsize) {
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size_t size = 0;
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uint8_t* buf = 0;
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#ifdef POSIX
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int fd = 0;
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fd = open(path, O_RDONLY);
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SGUARD(fd);
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size = lseek(fd, 0, SEEK_END);
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SGUARD(size);
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buf = mmap(0, size, PROT_READ, MAP_PRIVATE, fd, 0);
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SGUARD(buf);
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SGUARD(close(fd));
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#else
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FILE* fp = 0;
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fp = fopen(path, "rb");
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GUARD(fp);
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GUARD(fseek(fp, 0, SEEK_END));
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size = ftell(fp);
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rewind(fp);
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buf = xmalloc(size);
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GUARD(fread(buf, 1, size, fp) == size);
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GUARD(fclose(fp));
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#endif
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*rsize = size;
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return buf;
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}
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// free read file
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void freeFile(uint8_t* buf, size_t size) {
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#ifdef POSIX
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SGUARD(munmap(buf, size));
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#else
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xfree(buf);
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#endif
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}
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