test: extend coverage of streq

user/herestest.c

@@ -0,0 +1,53 @@
+#include "ulib.h"
+
+/*
+ * Live ring-3 proof for shell.c's new `cmd <<< TEXT` here-string syntax
+ * (jobctl.c's jobctlSpawnForegroundHereString/jobctlSpawnHereStringPiped):
+ * from this program's own point of view fd 0 is just an ordinary blocking
+ * pipe read end, exactly like pipesink.c's -- it has no idea the other end
+ * was ever the SHELL ITSELF writing literal typed text into a pipe rather
+ * than another spawned process's stdout. Reads to real EOF, then compares
+ * byte-for-byte against the exact text kmain.c's hereDriverThread types
+ * after `<<<` plus the single trailing newline jobctlSpawnHereStringPiped
+ * always appends (matching a real shell's own `<<<` behavior of feeding
+ * the text as one full line, terminator included).
+ */
+#define hereStringPayload "hs-ok\n"
+
+static int streq(const char* a, const char* b)
+{
+    while (*a && *a == *b) {
+        a++;
+        b++;
+    }
+    return *a == *b;
+}
+
+int main(void)
+{
+    print("herestest: reading redirected stdin\n");
+
+    char buffer[32];
+    unsigned long total = 0;
+    for (;;) {
+        long got = userRead(0, buffer + total, sizeof(buffer) - 1 - total);
+        if (got < 0) {
+            print("herestest: FAIL read\n");
+            return 1;
+        }
+        if (got == 0)
+            break;
+        total += (unsigned long)got;
+        if (total >= sizeof(buffer) - 1)
+            break;
+    }
+    buffer[total] = 0;
+
+    print("herestest: got: ");
+    print(buffer);
+
+    int ok = streq(buffer, hereStringPayload);
+    print(ok ? "herestest: payload-ok\n" : "herestest: payload-FAIL\n");
+
+    return ok ? 0 : 1;
+}