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-rw-r--r--stdio/xbug.c63
1 files changed, 63 insertions, 0 deletions
diff --git a/stdio/xbug.c b/stdio/xbug.c
new file mode 100644
index 0000000..ec648f5
--- /dev/null
+++ b/stdio/xbug.c
@@ -0,0 +1,63 @@
+#include <stdio.h>
+
+typedef struct _Buffer {
+ char *buff;
+ int room, used;
+} Buffer;
+
+#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;
+ 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);
+}
+
+main()
+{
+ char * filename = "xbug.c";
+ FILE *input;
+ Buffer buffer;
+
+ InitBuffer(&buffer);
+
+ if (!freopen (filename, "r", stdin))
+ fprintf(stderr, "cannot open file\n");
+
+ if (!(input = popen("/bin/cat", "r")))
+ fprintf(stderr, "cannot run \n");
+
+ ReadFile(&buffer, input);
+ pclose(input);
+
+ return 0;
+}