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glibc/stdio-common/xbug.c
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#include <stdio.h> | |
#include <stdlib.h> | |
#include <string.h> | |
typedef struct _Buffer { | |
char *buff; | |
int room, used; | |
} Buffer; | |
void InitBuffer (Buffer *b); | |
void AppendToBuffer (Buffer *b, const char *str, int len); | |
void ReadFile (Buffer *buffer, FILE *input); | |
#define INIT_BUFFER_SIZE 10000 | |
void | |
InitBuffer (Buffer *b) | |
{ | |
b->room = INIT_BUFFER_SIZE; | |
b->used = 0; | |
b->buff = (char *)malloc(INIT_BUFFER_SIZE*sizeof(char)); | |
} | |
void | |
AppendToBuffer (Buffer *b, const char *str, int len) | |
{ | |
while (b->used + len > b->room) { | |
b->buff = (char *)realloc(b->buff, 2*b->room*(sizeof(char))); | |
b->room *= 2; | |
} | |
strncpy(b->buff + b->used, str, len); | |
b->used += len; | |
} | |
void | |
ReadFile (Buffer *buffer, FILE *input) | |
{ | |
char buf[BUFSIZ + 1]; | |
int bytes; | |
buffer->used = 0; | |
while (!feof(input) && (bytes = fread(buf, 1, BUFSIZ, input)) > 0) { | |
AppendToBuffer(buffer, buf, bytes); | |
} | |
AppendToBuffer(buffer, "", 1); | |
} | |
int | |
main(int argc, char *argv[]) | |
{ | |
char filename[] = "xbug.c"; | |
FILE *input; | |
Buffer buffer; | |
InitBuffer(&buffer); | |
if (!freopen (filename, "r", stdin)) | |
fprintf(stderr, "cannot open file\n"); | |
unsetenv ("LD_LIBRARY_PATH"); | |
if (!(input = popen("/bin/cat", "r"))) | |
fprintf(stderr, "cannot run \n"); | |
ReadFile(&buffer, input); | |
pclose(input); | |
return 0; | |
} |