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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;
}
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