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open/read vs open/mmap vs open/bufio.read on golang.
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#include <sys/types.h> | |
#include <sys/stat.h> | |
#include <unistd.h> | |
#include <errno.h> | |
#include <stdio.h> | |
#include <stdlib.h> | |
#include <string.h> | |
inline int get_fsize(const char *path) { | |
struct stat sb; | |
int err; | |
err = stat(path, &sb); | |
if (err) { | |
fprintf(stderr, "fstat error! [%s]\n", strerror(errno)); | |
return -1; | |
} | |
return sb.st_size; | |
} | |
int main(int argc, char *argv[]) { | |
FILE *fp; | |
char *path, *buf; | |
int i, cnt = 0; | |
int fsize; | |
int length; | |
if (argc < 2) { | |
fprintf(stderr, "require file path.\n"); | |
return -1; | |
} | |
path = argv[1]; | |
fsize = get_fsize(path); | |
if (fsize < 0) { | |
return -1; | |
} | |
buf = (char*)malloc(fsize); | |
fp = fopen(path, "r"); | |
length = fread(buf, 1, fsize, fp); | |
if (length < fsize) { | |
fprintf(stderr, "fread error! [%d]\n", length); | |
} | |
for (i=0; i<fsize; i++) { | |
if (buf[i] == 0x00) cnt++; | |
} | |
free(buf); | |
fclose(fp); | |
printf("%s: size=%d cnt=%d\n", path, fsize, cnt); | |
return 0; | |
} |
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