92 lines
2.2 KiB
C++
92 lines
2.2 KiB
C++
// RUN: %clangxx -g %s -o %t && %run %t | FileCheck %s
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// CHECK: READ CALLED; len={{[0-9]*}}
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// CHECK-NEXT: READ: test
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// CHECK-NEXT: WRITE CALLED: test
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// CHECK-NEXT: READ CALLED; len={{[0-9]*}}
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// CHECK-NEXT: READ: test
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// CHECK-NEXT: WRITE CALLED: test
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// CHECK-NEXT: CLOSE CALLED
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// CHECK-NEXT: SEEK CALLED; off=100, whence=0
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// CHECK-NEXT: READ CALLED; len={{[0-9]*}}
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// CHECK-NEXT: READ: test
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//
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// UNSUPPORTED: linux, darwin, solaris
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#include <assert.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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int cookie_var;
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int f_read(void *cookie, char *buf, int len) {
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assert(cookie == &cookie_var);
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assert(len >= 6);
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printf("READ CALLED; len=%d\n", len);
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return strlcpy(buf, "test\n", len);
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}
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int f_write(void *cookie, const char *buf, int len) {
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assert(cookie == &cookie_var);
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char *data = strndup(buf, len);
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assert(data);
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printf("WRITE CALLED: %s\n", data);
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free(data);
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return len;
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}
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off_t f_seek(void *cookie, off_t off, int whence) {
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assert(cookie == &cookie_var);
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assert(whence == SEEK_SET);
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printf("SEEK CALLED; off=%d, whence=%d\n", (int)off, whence);
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return off;
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}
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int f_close(void *cookie) {
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assert(cookie == &cookie_var);
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printf("CLOSE CALLED\n");
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return 0;
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}
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int main(void) {
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FILE *fp;
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char buf[10];
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// 1. read-only variant
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fp = fropen(&cookie_var, f_read);
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assert(fp);
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// verify that fileno() does not crash or report nonsense
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assert(fileno(fp) == -1);
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assert(fgets(buf, sizeof(buf), fp));
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printf("READ: %s", buf);
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assert(!fclose(fp));
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// 2. write-only variant
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fp = fwopen(&cookie_var, f_write);
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assert(fp);
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assert(fileno(fp) == -1);
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assert(fputs("test", fp) >= 0);
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assert(!fclose(fp));
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// 3. read+write+close
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fp = funopen(&cookie_var, f_read, f_write, NULL, f_close);
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assert(fp);
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assert(fileno(fp) == -1);
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assert(fgets(buf, sizeof(buf), fp));
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printf("READ: %s", buf);
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assert(fputs("test", fp) >= 0);
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assert(!fclose(fp));
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// 4. read+seek
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fp = funopen(&cookie_var, f_read, NULL, f_seek, NULL);
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assert(fp);
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assert(fileno(fp) == -1);
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assert(fseek(fp, 100, SEEK_SET) == 0);
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assert(fgets(buf, sizeof(buf), fp));
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printf("READ: %s", buf);
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assert(!fclose(fp));
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return 0;
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}
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