#include <stdio.h> #include <stdlib.h> #include <string.h> typedef struct _Buffer { char *buff; int room, used; } Buffer; #if __STDC__ - 0 void InitBuffer (Buffer *b); void AppendToBuffer (register Buffer *b, const char *str, register int len); void ReadFile (register Buffer *buffer, FILE *input); #endif #define INIT_BUFFER_SIZE 10000 void InitBuffer(b) Buffer *b; { b->room = INIT_BUFFER_SIZE; b->used = 0; b->buff = (char *)malloc(INIT_BUFFER_SIZE*sizeof(char)); } void AppendToBuffer(b, str, len) register Buffer *b; const char *str; register 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, input) register Buffer *buffer; FILE *input; { char buf[BUFSIZ + 1]; register 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; }