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