Add a naive /bin/fgrep for testing pipes.

Author: https://github.com/awesomekling
Commit: https://github.com/SerenityOS/serenity/commit/18e3ddf6058

Kernel/TTY.cpp

@@ -20,7 +20,7 @@ ssize_t TTY::read(byte* buffer, size_t size)
     if (nread == (ssize_t)m_buffer.size())
         m_buffer.clear();
     else {
-        dbgprintf("had %u, read %u\n", m_buffer.size(), nread);
+        kprintf("had %u, read %u\n", m_buffer.size(), nread);
         ASSERT_NOT_REACHED();
     }
     return nread;

Kernel/sync.sh

@@ -8,6 +8,7 @@ cp -v ../Userland/sh mnt/bin/sh
 cp -v ../Userland/id mnt/bin/id
 cp -v ../Userland/ps mnt/bin/ps
 cp -v ../Userland/ls mnt/bin/ls
+cp -v ../Userland/fgrep mnt/bin/fgrep
 cp -v ../Userland/sleep mnt/bin/sleep
 cp -v ../Userland/date mnt/bin/date
 cp -v ../Userland/true mnt/bin/true

LibC/string.cpp

@@ -191,4 +191,23 @@ char* strsignal(int signum)
     return const_cast<char*>(sys_siglist[signum]);
 }
 
+char* strstr(const char* haystack, const char* needle)
+{
+    char nch;
+    char hch;
+
+    if ((nch = *needle++) != 0) {
+        size_t len = strlen(needle);
+        do {
+            do {
+                if ((hch = *haystack++) == 0)
+                    return nullptr;
+            } while (hch != nch);
+        } while (strncmp(haystack, needle, len) != 0);
+        --haystack;
+    }
+    return const_cast<char*>(haystack);
 }
+
+}
+

LibC/string.h

@@ -17,6 +17,7 @@ void* memset(void*, int, size_t);
 char* strcpy(char* dest, const char* src);
 char* strncpy(char* dest, const char* src, size_t);
 char* strchr(const char*, int c);
+char* strstr(const char* haystack, const char* needle);
 char* strrchr(const char*, int c);
 char* strcat(char *dest, const char *src);
 char* strncat(char *dest, const char *src, size_t);

LibC/termcap.cpp

@@ -23,13 +23,13 @@ int tgetent(char* bp, const char* name)
     assert(false);
 }
 
-static HashMap<String, String>* caps = nullptr;
+static HashMap<String, const char*>* caps = nullptr;
 
 void ensure_caps()
 {
     if (caps)
         return;
-    caps = new HashMap<String, String>;
+    caps = new HashMap<String, const char*>;
     caps->set("DC", "\033[%p1%dP");
     caps->set("IC", "\033[%p1%d@");
     caps->set("ce", "\033[K");
@@ -60,12 +60,13 @@ void ensure_caps()
 char* tgetstr(char* id, char** area)
 {
     ensure_caps();
-    fprintf(stderr, "tgetstr: id='%s', area=%p\n", id, area);
+    fprintf(stderr, "tgetstr: id='%s', area=%p", id, area);
     auto it = caps->find(id);
     if (it != caps->end()) {
         char* ret = *area;
-        strcpy(*area, (*it).value.characters());
-        *area += (*it).value.length() + 1;
+        const char* val = (*it).value;
+        strcpy(*area, val);
+        *area += strlen(val) + 1;
         return ret;
     }
     assert(false);
@@ -85,7 +86,7 @@ int tgetnum(char* id)
     fprintf(stderr, "tgetnum: '%s'\n", id);
     auto it = caps->find(id);
     if (it != caps->end()) {
-        return atoi((*it).value.characters());
+        return atoi((*it).value);
     }
     assert(false);
 }
@@ -97,7 +98,7 @@ char* tgoto(const char* cap, int col, int row)
 
 int tputs(const char* str, int affcnt, int (*putc)(int))
 {
-    assert(false);
+    printf("%s", str);
 }
 
 }

Userland/.gitignore

@@ -19,3 +19,4 @@ tty
 ft
 ft2
 strsignal
+fgrep

Userland/Makefile

@@ -17,6 +17,7 @@ OBJS = \
        ft.o \
        ft2.o \
        strsignal.o \
+       fgrep.o \
        tty.o
 
 APPS = \
@@ -38,6 +39,7 @@ APPS = \
        ft \
        ft2 \
        strsignal \
+       fgrep \
        tty
 
 ARCH_FLAGS =
@@ -70,6 +72,9 @@ ps: ps.o
 ls: ls.o
 	$(LD) -o $@ $(LDFLAGS) $< ../LibC/LibC.a
 
+fgrep: fgrep.o
+	$(LD) -o $@ $(LDFLAGS) $< ../LibC/LibC.a
+
 sleep: sleep.o
 	$(LD) -o $@ $(LDFLAGS) $< ../LibC/LibC.a
 

Userland/fgrep.cpp

@@ -0,0 +1,20 @@
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+
+int main(int argc, char** argv)
+{
+    if (argc < 2) {
+        printf("usage: fgrep <str>\n");
+        return 0;
+    }
+    for (;;) {
+        char buf[4096];
+        fgets(buf, sizeof(buf), stdin);
+        if (feof(stdin))
+            return 0;
+        if (strstr(buf, argv[1]))
+            write(1, buf, strlen(buf));
+    }
+    return 0;
+}