Enough compatibility work to make figlet build and run!

I ran out of steam writing library routines and imported two
BSD-licensed libc routines: sscanf() and getopt().

I will most likely rewrite them sooner or later. For now
I just wanted to see figlet running.

LibC/Makefile

@@ -17,6 +17,8 @@ LIBC_OBJS = \
        utsname.o \
        assert.o \
        signal.o \
+       getopt.o \
+       scanf.o \
        entry.o
 
 OBJS = $(AK_OBJS) $(LIBC_OBJS)

LibC/assert.h

@@ -6,7 +6,7 @@ __BEGIN_DECLS
 
 void __assertion_failed(const char* msg, const char* file, unsigned line, const char* func);
 
-#define assert(expr) (static_cast<bool>(expr) ? (void)0 : __assertion_failed(#expr, __FILE__, __LINE__, __PRETTY_FUNCTION__))
+#define assert(expr) ((expr) ? (void)0 : __assertion_failed(#expr, __FILE__, __LINE__, __PRETTY_FUNCTION__))
 #define CRASH() do { asm volatile("ud2"); } while(0)
 #define ASSERT assert
 #define RELEASE_ASSERT assert

LibC/entry.cpp

@@ -10,9 +10,14 @@ int errno;
 FILE* stdin;
 FILE* stdout;
 FILE* stderr;
+char** environ;
+
+extern "C" void __malloc_init();
 
 extern "C" int _start()
 {
+    __malloc_init();
+
     errno = 0;
 
     __default_streams[0].fd = 0;
@@ -26,12 +31,18 @@ extern "C" int _start()
 
     StringImpl::initializeGlobals();
 
+    int status = 254;
     int argc;
     char** argv;
     int rc = Syscall::invoke(Syscall::GetArguments, (dword)&argc, (dword)&argv);
-    int status = 254;
-    if (rc == 0)
-        status = main(argc, argv);
+    if (rc < 0)
+        goto epilogue;
+    rc = Syscall::invoke(Syscall::GetEnvironment, (dword)&environ);
+    if (rc < 0)
+        goto epilogue;
+    status = main(argc, argv);
+
+epilogue:
     Syscall::invoke(Syscall::PosixExit, status);
 
     // Birger's birthday <3

LibC/getopt.cpp

@@ -0,0 +1,109 @@
+/*
+ * Copyright (c) 1987, 1993, 1994
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by the University of
+ *	California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <getopt.h>
+
+#include <assert.h>
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+int	opterr = 1; /* if error message should be printed */
+int optind = 1; /* index into parent argv vector */
+int optopt;     /* character checked for validity */
+int optreset;   /* reset getopt */
+char *optarg;   /* argument associated with option */
+
+#define	BADCH  (int)'?'
+#define	BADARG (int)':'
+#define	EMSG   ""
+
+int getopt(int nargc, char* const nargv[], const char* ostr)
+{
+    static const char* place = EMSG; /* option letter processing */
+    char *oli; /* option letter list index */
+
+    ASSERT(nargv != NULL);
+    ASSERT(ostr != NULL);
+
+    if (optreset || !*place) { /* update scanning pointer */
+        optreset = 0;
+        if (optind >= nargc || *(place = nargv[optind]) != '-') {
+            place = EMSG;
+            return (-1);
+        }
+        if (place[1] && *++place == '-' /* found "--" */
+            && place[1] == '\0') {
+            ++optind;
+            place = EMSG;
+            return -1;
+        }
+    }					/* option letter okay? */
+    if ((optopt = (int)*place++) == (int)':' || !(oli = strchr(ostr, optopt))) {
+        /*
+         * if the user didn't specify '-' as an option,
+         * assume it means -1.
+         */
+        if (optopt == (int)'-')
+            return -1;
+        if (!*place)
+            ++optind;
+        if (opterr && *ostr != ':')
+            fprintf(stderr, "unknown option -- %c\n", optopt);
+        return BADCH;
+    }
+    if (*++oli != ':') { /* don't need argument */
+        optarg = NULL;
+        if (!*place)
+            ++optind;
+    }
+    else { /* need an argument */
+        if (*place) /* no white space */
+            optarg = (char*)place;
+        else if (nargc <= ++optind) { /* no arg */
+            place = EMSG;
+            if (*ostr == ':')
+                return BADARG;
+            if (opterr)
+                fprintf(stderr, "option requires an argument -- %c\n", optopt);
+            return BADCH;
+        }
+        else /* white space */
+            optarg = nargv[optind];
+        place = EMSG;
+        ++optind;
+    }
+    return optopt; /* dump back option letter */
+}

LibC/getopt.h

@@ -0,0 +1,13 @@
+#pragma once
+
+#include <sys/cdefs.h>
+
+__BEGIN_DECLS
+
+int getopt(int argc, char* const argv[], const char* optstring);
+extern char* optarg;
+extern int optind;
+extern int opterr;
+extern int optopt;
+
+__END_DECLS

LibC/scanf.cpp

@@ -0,0 +1,255 @@
+/*
+ * Copyright (c) 2000-2002 Opsycon AB  (www.opsycon.se)
+ * 
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *    This product includes software developed by Opsycon AB.
+ * 4. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
+ * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ */
+#include <stdio.h>
+#include <stdarg.h>
+#include <string.h>
+#include <ctype.h>
+
+#define MAXLN 512
+
+static const char* determineBase(const char* p, int& base)
+{
+    if (p[0] == '0') {
+        switch (p[1]) {
+        case 'x':
+            base = 16;
+            break;
+        case 't':
+        case 'n':
+            base = 10;
+            break;
+        case 'o':
+            base = 8;
+            break;
+        default:
+            base = 10;
+            return p;
+        }
+        return p + 2;
+    }
+    base = 10;
+    return p;
+}
+
+static int _atob(unsigned long* vp, const char* p, int base)
+{
+    unsigned long value, v1, v2;
+    char *q, tmp[20];
+    int digit;
+
+    if (p[0] == '0' && (p[1] == 'x' || p[1] == 'X')) {
+        base = 16;
+        p += 2;
+    }
+
+    if (base == 16 && (q = strchr(p, '.')) != 0) {
+        if (q - p > sizeof(tmp) - 1)
+            return 0;
+        strncpy(tmp, p, q - p);
+        tmp[q - p] = '\0';
+        if (!_atob(&v1, tmp, 16))
+            return 0;
+        ++q;
+        if (strchr(q, '.'))
+            return 0;
+        if (!_atob(&v2, q, 16))
+            return 0;
+        *vp = (v1 << 16) + v2;
+        return 1;
+    }
+
+    value = *vp = 0;
+    for (; *p; p++) {
+        if (*p >= '0' && *p <= '9')
+            digit = *p - '0';
+        else if (*p >= 'a' && *p <= 'f')
+            digit = *p - 'a' + 10;
+        else if (*p >= 'A' && *p <= 'F')
+            digit = *p - 'A' + 10;
+        else
+            return 0;
+
+        if (digit >= base)
+            return 0;
+        value *= base;
+        value += digit;
+    }
+    *vp = value;
+    return 1;
+}
+
+int atob(unsigned int* vp, const char* p, int base)
+{
+    unsigned long v;
+
+    if (base == 0)
+        p = determineBase(p, base);
+    if (_atob(&v, p, base)) {
+        *vp = v;
+        return 1;
+    }
+    return 0;
+}
+
+static int vfscanf(FILE*, const char*, va_list);
+static int vsscanf(const char*, const char*, va_list);
+
+#define ISSPACE " \t\n\r\f\v"
+
+int scanf(const char* fmt, ...)
+{
+    int count;
+    va_list ap;
+    
+    va_start(ap, fmt);
+    count = vfscanf(stdin, fmt, ap);
+    va_end(ap);
+    return count;
+}
+
+int fscanf(FILE *fp, const char* fmt, ...)
+{
+    va_list ap;
+    va_start(ap, fmt);
+    int count = vfscanf(fp, fmt, ap);
+    va_end(ap);
+    return count;
+}
+
+int sscanf(const char *buf, const char* fmt, ...)
+{
+    va_list ap;
+    va_start(ap, fmt);
+    int count = vsscanf(buf, fmt, ap);
+    va_end(ap);
+    return count;
+}
+
+static int vfscanf(FILE *fp, const char* fmt, va_list ap)
+{
+    char buf[MAXLN + 1];
+    if (!fgets(buf, MAXLN, fp))
+        return -1;
+    int count = vsscanf(buf, fmt, ap);
+    return count;
+}
+
+static int vsscanf(const char *buf, const char *s, va_list ap)
+{
+    int base;
+    char *t;
+    char tmp[MAXLN];
+    bool noassign = false;
+    bool lflag = false;
+    int count = 0;
+    int width = 0;
+
+    while (*s && *buf) {
+        while (isspace (*s))
+            s++;
+        if (*s == '%') {
+            s++;
+            for (; *s; s++) {
+                if (strchr ("dibouxcsefg%", *s))
+                    break;
+                if (*s == '*')
+                    noassign = true;
+                else if (*s == 'l' || *s == 'L')
+                    lflag = true;
+                else if (*s >= '1' && *s <= '9') {
+                    const char* tc;
+                    for (tc = s; isdigit(*s); s++);
+                    strncpy (tmp, tc, s - tc);
+                    tmp[s - tc] = '\0';
+                    atob ((dword*)&width, tmp, 10);
+                    s--;
+                }
+            }
+            if (*s == 's') {
+                while (isspace(*buf))
+                    buf++;
+                if (!width)
+                    width = strcspn(buf, ISSPACE);
+                if (!noassign) {
+                    strncpy(t = va_arg(ap, char*), buf, width);
+                    t[width] = '\0';
+                }
+                buf += width;
+            } else if (*s == 'c') {
+                if (!width)
+                    width = 1;
+                if (!noassign) {
+                    strncpy(t = va_arg(ap, char*), buf, width);
+                    t[width] = '\0';
+                }
+                buf += width;
+            } else if (strchr("dobxu", *s)) {
+                while (isspace(*buf))
+                    buf++;
+                if (*s == 'd' || *s == 'u')
+                    base = 10;
+                else if (*s == 'x')
+                    base = 16;
+                else if (*s == 'o')
+                    base = 8;
+                else if (*s == 'b')
+                    base = 2;
+                if (!width) {
+                    if (isspace(*(s + 1)) || *(s + 1) == 0)
+                        width = strcspn(buf, ISSPACE);
+                    else
+                        width = strchr(buf, *(s + 1)) - buf;
+                }
+                strncpy(tmp, buf, width);
+                tmp[width] = '\0';
+                buf += width;
+                if (!noassign)
+                    atob(va_arg(ap, dword*), tmp, base);
+            }
+            if (!noassign)
+                ++count;
+            width = 0;
+            noassign = false;
+            lflag = false;
+            ++s;
+        } else {
+            while (isspace(*buf))
+            buf++;
+            if (*s != *buf)
+                break;
+            else {
+                ++s;
+                ++buf;
+            }
+        }
+    }
+    return count;
+}

LibC/stdio.cpp

@@ -4,15 +4,113 @@
 #include <string.h>
 #include <errno.h>
 #include <unistd.h>
+#include <assert.h>
+#include <stdlib.h>
 #include <Kernel/Syscall.h>
 #include <AK/printf.cpp>
 
 extern "C" {
 
+int fileno(FILE* stream)
+{
+    return stream->fd;
+}
+
+int feof(FILE* stream)
+{
+    return stream->eof;
+}
+
+char* fgets(char* buffer, int size, FILE* stream)
+{
+    ssize_t nread = 0;
+    for (;;) {
+        if (nread >= size)
+            break;
+        char ch = fgetc(stream);
+        if (feof(stream))
+            break;
+        buffer[nread++] = ch;
+        if (!ch || ch == '\n')
+            break;
+    }
+    if (nread < size)
+        buffer[nread] = '\0';
+    return buffer;
+}
+
+int fgetc(FILE* stream)
+{
+    char ch;
+    read(stream->fd, &ch, 1);
+    return ch;
+}
+
+int getc(FILE* stream)
+{
+    return fgetc(stream);
+}
+
+int getchar()
+{
+    return getc(stdin);
+}
+
+int fputc(int ch, FILE* stream)
+{
+    write(stream->fd, &ch, 1);
+    return (byte)ch;
+}
+
+int putc(int ch, FILE* stream)
+{
+    return fputc(ch, stream);
+}
+
 int putchar(int ch)
 {
-    write(0, &ch, 1);
-    return (byte)ch;
+    return putc(ch, stdout);
+}
+
+void clearerr(FILE* stream)
+{
+    stream->eof = false;
+}
+
+size_t fread(void* ptr, size_t size, size_t nmemb, FILE* stream)
+{
+    ssize_t nread = read(stream->fd, ptr, nmemb * size);
+    if (nread < 0)
+        return 0;
+    if (nread == 0)
+        stream->eof = true;
+    return nread;
+}
+
+size_t fwrite(const void* ptr, size_t size, size_t nmemb, FILE* stream)
+{
+    ssize_t nwritten = write(stream->fd, ptr, nmemb * size);
+    if (nwritten < 0)
+        return 0;
+    return nwritten;
+}
+
+int fseek(FILE* stream, long offset, int whence)
+{
+    off_t off = lseek(stream->fd, offset, whence);
+    if (off < 0)
+        return off;
+    return 0;
+}
+
+long ftell(FILE* stream)
+{
+    return lseek(stream->fd, 0, SEEK_CUR);
+}
+
+void rewind(FILE* stream)
+{
+    fseek(stream, 0, SEEK_SET);
 }
 
 static void sys_putch(char*&, char ch)
@@ -65,5 +163,24 @@ void perror(const char* s)
     printf("%s: %s\n", s, strerror(errno));
 }
 
+FILE* fopen(const char* pathname, const char* mode)
+{
+    assert(!strcmp(mode, "r") || !strcmp(mode, "rb"));
+    int fd = open(pathname, O_RDONLY);
+    if (fd < 0)
+        return nullptr;
+    auto* fp = (FILE*)malloc(sizeof(FILE));
+    fp->fd = fd;
+    fp->eof = false;
+    return fp;
+}
+
+int fclose(FILE* stream)
+{
+    int rc = close(stream->fd);
+    free(stream);
+    return rc;
+}
+
 }
 

LibC/stdio.h

@@ -1,6 +1,7 @@
 #pragma once
 
 #include <sys/cdefs.h>
+#include <sys/types.h>
 
 __BEGIN_DECLS
 
@@ -8,8 +9,13 @@ __BEGIN_DECLS
 #define EOF (-1)
 #endif
 
+#define SEEK_SET 0
+#define SEEK_CUR 1
+#define SEEK_END 2
+
 struct __STDIO_FILE {
     int fd;
+    int eof;
 };
 
 typedef struct __STDIO_FILE FILE;
@@ -18,11 +24,21 @@ extern FILE* stdin;
 extern FILE* stdout;
 extern FILE* stderr;
 
+char* fgets(char* buffer, int size, FILE*);
+int fileno(FILE*);
+int fgetc(FILE*);
+int getc(FILE*);
+int getchar();
+FILE* fopen(const char* pathname, const char* mode);
+int fclose(FILE*);
+size_t fread(void* ptr, size_t size, size_t nmemb, FILE*);
+size_t fwrite(const void* ptr, size_t size, size_t nmemb, FILE*);
 int fprintf(FILE*, const char* fmt, ...);
 int printf(const char* fmt, ...);
 int sprintf(char* buffer, const char* fmt, ...);
 int putchar(int ch);
 void perror(const char*);
+int sscanf (const char* buf, const char* fmt, ...);
 
 __END_DECLS
 

LibC/stdlib.cpp

@@ -1,32 +1,50 @@
-#include "stdlib.h"
-#include "mman.h"
-#include "stdio.h"
+#include <stdlib.h>
+#include <mman.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <string.h>
+#include <alloca.h>
 #include <Kernel/Syscall.h>
 #include <AK/Assertions.h>
 
 extern "C" {
 
+// FIXME: This is a temporary malloc() implementation. It never frees anything,
+//        and you can't allocate more than 128 kB total.
+static const size_t mallocBudget = 131072;
+
+static byte* nextptr = nullptr;
+static byte* endptr = nullptr;
+
+void __malloc_init()
+{
+    nextptr = (byte*)mmap(nullptr, mallocBudget);
+    endptr = nextptr + mallocBudget;
+    int rc = set_mmap_name(nextptr, mallocBudget, "malloc");
+    if (rc < 0)
+        perror("set_mmap_name failed");
+}
+
 void* malloc(size_t size)
 {
-    if (size > 4096) {
+    if ((nextptr + size) > endptr) {
         volatile char* crashme = (char*)0xc007d00d;
         *crashme = 0;
     }
-    void* ptr = mmap(nullptr, 4096);
-    if (ptr) {
-        int rc = set_mmap_name(ptr, 4096, "malloc");
-        if (rc < 0) {
-            perror("set_mmap_name failed");
-        }
-    }
-    return ptr;
+    byte* ret = nextptr;
+    nextptr += size;
+    nextptr += 16;
+    nextptr = (byte*)((dword)nextptr & 0xfffffff0);
+    return ret;
 }
 
 void free(void* ptr)
 {
     if (!ptr)
         return;
+#if 0
     munmap(ptr, 4096);
+#endif
 }
 
 void* calloc(size_t nmemb, size_t)
@@ -52,5 +70,41 @@ void abort()
     exit(253);
 }
 
+char* getenv(const char* name)
+{
+    for (size_t i = 0; environ[i]; ++i) {
+        const char* decl = environ[i];
+        char* eq = strchr(decl, '=');
+        if (!eq)
+            continue;
+        size_t varLength = eq - decl;
+        char* var = (char*)alloca(varLength + 1);
+        memcpy(var, decl, varLength);
+        var[varLength] = '\0';
+        if (!strcmp(var, name)) {
+            char* value = eq + 1;
+            return value;
+        }
+    }
+    return nullptr;
 }
 
+int atoi(const char* str)
+{
+    ssize_t len = strlen(str);
+    int value = 0;
+    bool isNegative = false;
+    for (size_t i = 0; i < len; ++i) {
+        if (i == 0 && str[0] == '-') {
+            isNegative = true;
+            continue;
+        }
+        if (str[i] < '0' || str[i] > '9')
+            return 0;
+        value = value * 10;
+        value += str[i] - '0';
+    }
+    return isNegative ? -value : value;
+}
+
+}

LibC/stdlib.h

@@ -9,7 +9,8 @@ void* malloc(size_t);
 void free(void*);
 void* calloc(size_t nmemb, size_t);
 void* realloc(void *ptr, size_t);
-
+char* getenv(const char* name);
+int atoi(const char*);
 
 void exit(int status);
 void abort();

LibC/string.cpp

@@ -4,6 +4,40 @@
 
 extern "C" {
 
+void* memset(void* dest, int c, size_t n)
+{
+    byte* bdest = (byte*)dest;
+    for (; n; --n)
+        *(bdest++) = c;
+    return dest;
+}
+
+size_t strspn(const char* s, const char* accept)
+{
+    const char* p = s;
+cont:
+    char ch = *p++;
+    char ac;
+    for (const char* ap = accept; (ac = *ap++) != '\0';) {
+        if (ac == ch)
+            goto cont;
+    }
+    return p - 1 - s;
+}
+
+size_t strcspn(const char* s, const char* reject)
+{
+    for (auto* p = s;;) {
+        char c = *p++;
+        auto* rp = reject;
+        char rc;
+        do {
+            if ((rc = *rp++) == c)
+                return p - 1 - s;
+        } while(rc);
+    }
+}
+
 size_t strlen(const char* str)
 {
     size_t len = 0;
@@ -62,11 +96,22 @@ char* strchr(const char* str, int c)
     if (!str)
         return nullptr;
     char* ptr = (char*)str;
-    while (*ptr != c)
+    while (*ptr && *ptr != c)
         ++ptr;
     return ptr;
 }
 
+char* strrchr(const char* str, int ch)
+{
+    char *last = nullptr;
+    char c;
+    for (; (c = *str); ++str) {
+        if (c == ch)
+            last = (char*)str;
+    }
+    return last;
+}
+
 char* strcat(char *dest, const char *src)
 {
     size_t destLength = strlen(dest);

LibC/string.h

@@ -9,11 +9,15 @@ size_t strlen(const char*);
 int strcmp(const char*, const char*);
 int memcmp(const void*, const void*, size_t);
 void memcpy(void*, const void*, size_t);
+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* strrchr(const char*, int c);
 char* strcat(char *dest, const char *src);
 char* strncat(char *dest, const char *src, size_t);
+size_t strspn(const char*, const char* accept);
+size_t strcspn(const char*, const char* reject);
 const char* strerror(int errnum);
 
 __END_DECLS

LibC/unistd.cpp

@@ -105,5 +105,11 @@ ssize_t readlink(const char* path, char* buffer, size_t size)
     __RETURN_WITH_ERRNO(rc, rc, -1);
 }
 
+off_t lseek(int fd, off_t offset, int whence)
+{
+    int rc = Syscall::invoke(Syscall::PosixLseek, (dword)fd, (dword)offset, (dword)whence);
+    __RETURN_WITH_ERRNO(rc, rc, -1);
+}
+
 }
 

LibC/unistd.h

@@ -5,6 +5,8 @@
 
 __BEGIN_DECLS
 
+extern char** environ;
+
 uid_t getuid();
 gid_t getgid();
 pid_t getpid();
@@ -22,6 +24,7 @@ int gethostname(char*, size_t);
 ssize_t readlink(const char* path, char* buffer, size_t);
 char* ttyname(int fd);
 int ttyname_r(int fd, char* buffer, size_t);
+off_t lseek(int fd, off_t, int whence);
 
 #define WEXITSTATUS(status) (((status) & 0xff00) >> 8)
 #define WTERMSIG(status) ((status) & 0x7f)