标准IO完结

Chapter13/io/stdio/getline.c

@@ -0,0 +1,40 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+int main(int argc, char **argv)
+{
+    FILE  *fp;
+    char  *linebuf;
+    size_t linesize;
+
+    if (argc < 2)
+    {
+        fprintf(stderr, "Usage...\n");
+        exit(1);
+    }
+
+    fp = fopen(argv[1], "r");
+    if (NULL == fp)
+    {
+        perror("fopen()");
+        exit(1);
+    }
+
+    // !!!
+    linebuf  = NULL;
+    linesize = 0;
+
+    while (1)
+    {
+        if (getline(&linebuf, &linesize, fp) < 0)
+            break;
+        printf("%d\n", strlen(linebuf));
+        printf("%d\n", linesize);
+        // 此时输出linesize值不对，是因为没有初始化
+        // 修改后发现，linesize初始值就是120，是后面不够再增加
+    }
+
+    fclose(fp);
+    exit(0);
+}