diff --git a/CMakeLists.txt b/CMakeLists.txt
index 993c94a..5ea67c7 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -7,6 +7,8 @@ add_library(Colla STATIC
     str.c 
     coroutine.c 
     os.c 
+    fs.c 
+    file.c 
 )
 
 IF (WIN32)
diff --git a/coroutine.h b/coroutine.h
index a3172b8..e4acbd5 100644
--- a/coroutine.h
+++ b/coroutine.h
@@ -4,8 +4,9 @@
 extern "C" {
 #endif
 
-#include <stdbool.h> // bool
-#include <string.h>  // memset
+#include <stdbool.h>  // bool
+#include <string.h>   // memset
+#include "tracelog.h" // fatal
 
 // heavily inspired by https://gist.github.com/Enichan/5f01140530ff0133fde19c9549a2a973
 
@@ -84,15 +85,20 @@ bool coIsDead(coroutine_t co);
     self.init = false;    \
     return false;
 
-#define coroutine(...)                  \
-    if(!self.init) {                    \
-        memset(&self, 0, sizeof(self)); \
-        self.init = true;               \
-    }                                   \
-    switch(COVAR->co.state) {           \
-        case 0:;                        \
-            __VA_ARGS__                 \
-    }                                   \
+#define coroutine(...)                                    \
+    if(!self.init) {                                      \
+        if(COVAR->co.state != 0) {                        \
+            fatal("coroutine not initialized in %s:%d,\n" \
+                  "did you forget to do '= {0};'?",       \
+                  __FILE__, __LINE__);                    \
+        }                                                 \
+        memset(&self, 0, sizeof(self));                   \
+        self.init = true;                                 \
+    }                                                     \
+    switch(COVAR->co.state) {                             \
+        case 0:;                                          \
+            __VA_ARGS__                                   \
+    }                                                     \
     yieldBreak();
 
 #define yield() _yield(__COUNTER__)
diff --git a/file.c b/file.c
new file mode 100644
index 0000000..18f3f76
--- /dev/null
+++ b/file.c
@@ -0,0 +1,160 @@
+#include "file.h"
+
+#include "tracelog.h"
+
+#ifdef _WIN32
+#define VC_EXTRALEAN
+#include <windows.h>
+
+static DWORD _toWin32Access(int mode) {
+    switch(mode) {
+        case FILE_READ:  return GENERIC_READ;
+        case FILE_WRITE: return GENERIC_WRITE;
+        case FILE_BOTH:  return GENERIC_READ | GENERIC_WRITE;
+        default: fatal("unrecognized mode: %d", mode); return 0;
+    }
+}
+
+static DWORD _toWin32Creation(int mode) {
+    switch(mode) {
+        case FILE_READ:  return OPEN_EXISTING;
+        case FILE_WRITE: return OPEN_ALWAYS;
+        case FILE_BOTH:  return OPEN_ALWAYS;
+        default: fatal("unrecognized mode: %d", mode); return 0;
+    }
+}
+
+file_t fileOpen(const char *fname, int mode) {
+    return (file_t) {
+        .handle = CreateFile(fname, 
+                             _toWin32Access(mode), 
+                             0, 
+                             NULL, 
+                             _toWin32Creation(mode), 
+                             FILE_ATTRIBUTE_NORMAL, 
+                             NULL)
+    };
+}
+
+void fileClose(file_t *ctx) {
+    if(ctx->handle) {
+        CloseHandle((HANDLE)ctx->handle);
+        ctx->handle = NULL;
+    }
+}
+
+bool fileIsValid(file_t *ctx) {
+    return ctx->handle != INVALID_HANDLE_VALUE;
+}
+
+bool filePutc(file_t *ctx, char c) {
+    return fileWrite(ctx, &c, 1) == 1;
+}
+
+bool filePuts(file_t *ctx, const char *str) {
+    size_t len = strlen(str);
+    return fileWrite(ctx, str, len) == len;
+}
+
+bool filePutstr(file_t *ctx, str_t str) {
+    return fileWrite(ctx, str.buf, str.len) == str.len;
+}
+
+bool filePutview(file_t *ctx, strview_t view) {
+    return fileWrite(ctx, view.buf, view.len) == view.len;
+}
+
+size_t fileRead(file_t *ctx, void *buf, size_t len) {
+    DWORD bytes_read = 0;
+    BOOL result = ReadFile((HANDLE)ctx->handle, buf, (DWORD)len, &bytes_read, NULL);
+    return result == TRUE ? (size_t)bytes_read : 0;
+}
+
+size_t fileWrite(file_t *ctx, const void *buf, size_t len) {
+    DWORD bytes_read = 0;
+    BOOL result = WriteFile((HANDLE)ctx->handle, buf, (DWORD)len, &bytes_read, NULL);
+    return result == TRUE ? (size_t)bytes_read : 0;
+}
+
+bool fileSeekEnd(file_t *ctx) {
+    return SetFilePointerEx((HANDLE)ctx->handle, (LARGE_INTEGER){0}, NULL, FILE_END) == TRUE;
+}
+
+void fileRewind(file_t *ctx) {
+    SetFilePointerEx((HANDLE)ctx->handle, (LARGE_INTEGER){0}, NULL, FILE_BEGIN);
+}
+
+uint64_t fileTell(file_t *ctx) {
+    LARGE_INTEGER tell;
+    BOOL result = SetFilePointerEx((HANDLE)ctx->handle, (LARGE_INTEGER){0}, &tell, FILE_CURRENT);
+    return result == TRUE ? (uint64_t)tell.QuadPart : 0;
+}
+
+#else
+#include <stdio.h>
+#include <errno.h>
+#include <string.h>
+
+const char *_toStdioMode(int mode) {
+    switch(mode) {
+        case FILE_READ: return "rb";
+        case FILE_BOTH: return "r+b";
+        case FILE_WRITE: return "wb";
+        default: fatal("mode not recognized: %d", mode); return "";
+    }
+}
+
+file_t fileOpen(const char *fname, int mode) {
+    return (file_t) {
+        .handle = (void*) fopen(fname, _toStdioMode(mode)),
+    };
+}
+
+void fileClose(file_t *ctx) {
+    if(ctx->handle) {
+        fclose((FILE*)ctx->handle);
+        ctx->handle = NULL;
+    }
+}
+
+bool fileIsValid(file_t *ctx) {
+    info("handle: %p", ctx->handle);
+    return ctx->handle != NULL;
+}
+
+bool filePutc(file_t *ctx, char c) {
+    return fputc(c, (FILE*)ctx->handle) == c;
+}
+
+bool filePuts(file_t *ctx, const char *str) {
+    return fputs(str, (FILE*)ctx->handle) != EOF;
+}
+
+bool filePutstr(file_t *ctx, str_t str) {
+    return fileWrite(ctx, str.buf, str.len) == str.len;
+}
+
+bool filePutview(file_t *ctx, strview_t view) {
+    return fileWrite(ctx, view.buf, view.len) == view.len;
+}
+
+size_t fileRead(file_t *ctx, void *buf, size_t len) {
+    return fread(buf, 1, len, (FILE*)ctx->handle);
+}
+
+size_t fileWrite(file_t *ctx, const void *buf, size_t len) {
+    return fwrite(buf, 1, len, (FILE*)ctx->handle);
+}
+
+bool fileSeekEnd(file_t *ctx) {
+    return fseek((FILE*)ctx->handle, 0, SEEK_END) == 0;
+}
+
+void fileRewind(file_t *ctx) {
+    rewind((FILE*)ctx->handle);
+}
+
+uint64_t fileTell(file_t *ctx) {
+    return (uint64_t)ftell((FILE*)ctx->handle);
+}
+#endif
\ No newline at end of file
diff --git a/file.h b/file.h
new file mode 100644
index 0000000..895be45
--- /dev/null
+++ b/file.h
@@ -0,0 +1,31 @@
+#pragma once
+
+#include <stdint.h>
+#include "str.h"
+#include "strview.h"
+
+enum {
+    FILE_READ, FILE_WRITE, FILE_BOTH
+};
+
+typedef struct {
+    void *handle;
+} file_t;
+
+file_t fileOpen(const char *fname, int mode);
+void fileClose(file_t *ctx);
+
+bool fileIsValid(file_t *ctx);
+
+bool filePutc(file_t *ctx, char c);
+bool filePuts(file_t *ctx, const char *str);
+bool filePutstr(file_t *ctx, str_t str);
+bool filePutview(file_t *ctx, strview_t view);
+
+size_t fileRead(file_t *ctx, void *buf, size_t len);
+size_t fileWrite(file_t *ctx, const void *buf, size_t len);
+
+bool fileSeekEnd(file_t *ctx);
+void fileRewind(file_t *ctx);
+
+uint64_t fileTell(file_t *ctx);
\ No newline at end of file
diff --git a/fs.c b/fs.c
new file mode 100644
index 0000000..4c3b0fb
--- /dev/null
+++ b/fs.c
@@ -0,0 +1,121 @@
+#include "fs.h"
+
+#include <time.h>
+#include <errno.h>
+#include <string.h>
+#include <stdio.h>
+
+#include "tracelog.h"
+
+#ifdef _WIN32
+#define VC_EXTRALEAN
+#include <windows.h>
+
+#include <sys/stat.h>
+
+static int _modeToType(unsigned int mode) {
+    switch(mode & _S_IFMT) {
+        case _S_IFDIR:  return FS_MODE_DIR;
+        case _S_IFCHR:  return FS_MODE_CHARACTER_DEVICE;
+        case _S_IFREG:  return FS_MODE_FILE;
+        case _S_IFIFO:  return FS_MODE_FIFO;
+        default:        return FS_MODE_UKNOWN;
+    }
+}
+
+fs_stat_t fsStat(file_t fp) {
+    TCHAR path[MAX_PATH];
+    DWORD pathlen = GetFinalPathNameByHandle(
+        (HANDLE)fp.handle,
+        path,
+        MAX_PATH,
+        0);
+
+    struct stat statbuf;
+    int res = stat(path, &statbuf);
+    if(res == 0) {
+        return (fs_stat_t) {
+            .type = _modeToType(statbuf.st_mode),
+            .size = statbuf.st_size,
+            .last_access = statbuf.st_atime,
+            .last_modif = statbuf.st_mtime
+        };
+    }
+    else {
+        return (fs_stat_t) { 0 };
+    }
+}
+
+fs_time_t fsAsTime(int64_t timer) {
+    struct tm t;
+    errno_t error = localtime_s(&t, &timer);
+    
+    if(error == 0) {
+        return (fs_time_t) {
+            .year = t.tm_year + 1900,
+            .month = t.tm_mon + 1,
+            .day = t.tm_mday,
+            .hour = t.tm_hour,
+            .minutes = t.tm_min,
+            .seconds = t.tm_sec,
+            .daylight_saving = t.tm_isdst > 0
+        };
+    }
+    else {
+        char buf[128];
+        strerror_s(buf, sizeof(buf), error);
+        err("%s", buf);
+        return (fs_time_t) { 0 };
+    }
+}
+
+#else
+#include <sys/stat.h>
+
+static int _modeToType(unsigned int mode) {
+    switch(mode & __S_IFMT) {
+        case __S_IFDIR:  return FS_MODE_DIR;
+        case __S_IFCHR:  return FS_MODE_CHARACTER_DEVICE;
+        case __S_IFREG:  return FS_MODE_FILE;
+        case __S_IFIFO:  return FS_MODE_FIFO;
+        default:         return FS_MODE_UKNOWN;
+    }
+}
+
+fs_stat_t fsStat(file_t fp) {
+    int fd = fileno((FILE*)fp.handle);
+    struct stat statbuf;
+    int res = fstat(fd, &statbuf);
+    if(res == 0) {
+        return (fs_stat_t) {
+            .type = _modeToType(statbuf.st_mode),
+            .size = statbuf.st_size,
+            .last_access = statbuf.st_atime,
+            .last_modif = statbuf.st_mtime
+        };
+    }
+    else {
+        return (fs_stat_t) { 0 };
+    }
+}
+
+fs_time_t fsAsTime(int64_t timer) {
+    struct tm *t = localtime(&timer);
+    
+    if(t) {
+        return (fs_time_t) {
+            .year = t->tm_year + 1900,
+            .month = t->tm_mon + 1,
+            .day = t->tm_mday,
+            .hour = t->tm_hour,
+            .minutes = t->tm_min,
+            .seconds = t->tm_sec,
+            .daylight_saving = t->tm_isdst > 0
+        };
+    }
+    else {
+        err("%s", strerror(errno));
+        return (fs_time_t) { 0 };
+    }
+}
+#endif
\ No newline at end of file
diff --git a/fs.h b/fs.h
new file mode 100644
index 0000000..da70ecc
--- /dev/null
+++ b/fs.h
@@ -0,0 +1,34 @@
+#pragma once
+
+#include <stdint.h>
+#include <stdbool.h>
+
+#include "file.h"
+
+enum {
+    FS_MODE_FILE,
+    FS_MODE_DIR,
+    FS_MODE_CHARACTER_DEVICE,
+    FS_MODE_FIFO,
+    FS_MODE_UKNOWN,
+};
+
+typedef struct {
+    int type;
+    uint64_t size;
+    int64_t last_access;
+    int64_t last_modif;
+} fs_stat_t;
+
+typedef struct {
+    int year;
+    int month;
+    int day;
+    int hour;
+    int minutes;
+    int seconds;
+    bool daylight_saving;
+} fs_time_t;
+
+fs_stat_t fsStat(file_t fp);
+fs_time_t fsAsTime(int64_t time);
diff --git a/http.c b/http.c
index 97bea8b..6b562ae 100644
--- a/http.c
+++ b/http.c
@@ -225,7 +225,7 @@ void resParseFields(http_response_t *ctx, str_istream_t *in) {
         }
 
         istrSkip(in, 2); // skip \r\n
-    } while(line.size > 2);
+    } while(line.len > 2);
 }
 
 // == HTTP CLIENT =============================================================
diff --git a/slice.h b/slice.h
new file mode 100644
index 0000000..f8aafd0
--- /dev/null
+++ b/slice.h
@@ -0,0 +1,5 @@
+#pragma once
+
+#include <stddef.h> // size_t
+
+#define slice_t(type) struct { type buf; size_t len; }
diff --git a/socket.c b/socket.c
index b639036..7d1f114 100644
--- a/socket.c
+++ b/socket.c
@@ -2,11 +2,8 @@
 
 #include <stdio.h>
 
-#undef INVALID_SOCKET
-#undef SOCKET_ERROR
-
 #if SOCK_WINDOWS
-#include <winsock2.h>
+#include <ws2tcpip.h>
 
 static bool _win_skInit();
 static bool _win_skCleanup();
@@ -72,7 +69,9 @@ bool skClose(socket_t sock) {
 bool skBind(socket_t sock, const char *ip, uint16_t port) {
     struct sockaddr_in addr;
     addr.sin_family = AF_INET;
+    // TODO use inet_pton instead
     addr.sin_addr.s_addr = inet_addr(ip);
+    
     addr.sin_port = htons(port);
 
     return skBindPro(sock, (struct sockaddr *) &addr, sizeof(addr));
@@ -101,6 +100,7 @@ socket_t skAcceptPro(socket_t sock, struct sockaddr *addr, socket_len_t *addrlen
 }
 
 bool skConnect(socket_t sock, const char *server, unsigned short server_port) {
+    // TODO use getaddrinfo insetad
     struct hostent *host = gethostbyname(server);
     // if gethostbyname fails, inet_addr will also fail and return an easier to debug error
     const char *address = server;
diff --git a/socket.h b/socket.h
index 625cd67..c369b91 100644
--- a/socket.h
+++ b/socket.h
@@ -19,8 +19,6 @@ struct sockaddr;
     #include <winsock2.h>
     typedef SOCKET socket_t;
     typedef int socket_len_t;
-    #define INVALID_SOCKET  (socket_t)(~0)
-    #define SOCKET_ERROR              (-1)
 #elif SOCK_POSIX
     #include <sys/socket.h> 
     typedef int socket_t;
diff --git a/str.c b/str.c
index 10e4954..b8e4369 100644
--- a/str.c
+++ b/str.c
@@ -16,7 +16,7 @@ str_t strInitStr(const char *cstr) {
 }
 
 str_t strInitView(strview_t view) {
-    return strInitBuf(view.buf, view.size);
+    return strInitBuf(view.buf, view.len);
 }
 
 str_t strInitBuf(const char *buf, size_t len) {
@@ -48,7 +48,7 @@ str_t strDup(str_t ctx) {
 strview_t strGetView(str_t *ctx) {
     return (strview_t) {
         .buf = ctx->buf,
-        .size = ctx->len
+        .len = ctx->len
     };
 }
 
@@ -77,7 +77,7 @@ void strAppendStr(str_t *ctx, str_t str) {
 }
 
 void strAppendView(str_t *ctx, strview_t view) {
-    strAppendBuf(ctx, view.buf, view.size);
+    strAppendBuf(ctx, view.buf, view.len);
 }
 
 void strAppendBuf(str_t *ctx, const char *buf, size_t len) {
@@ -130,7 +130,7 @@ strview_t strSubview(str_t *ctx, size_t pos, size_t len) {
     if(len == SIZE_MAX || (pos + len) > ctx->len) len = ctx->len - pos;
     return (strview_t) {
         .buf = ctx->buf + pos,
-        .size = len
+        .len = len
     };
 }
 
@@ -169,7 +169,7 @@ void strTest(void) {
     {
         s = strInitStr("hello world");
         strview_t view = strGetView(&s);
-        printf("\"%.*s\" %zu\n", (int)view.size, view.buf, view.size);
+        printf("\"%.*s\" %zu\n", (int)view.len, view.buf, view.len);
         strFree(&s);
     }
     debug("== testing begin/end ============");
@@ -255,9 +255,9 @@ void strTest(void) {
 
         printf("-- view\n");
         strview_t v = strSubview(&s, 0, 5);
-        printf("0..5: \"%.*s\"\n", (int)v.size, v.buf);
+        printf("0..5: \"%.*s\"\n", (int)v.len, v.buf);
         v = strSubview(&s, 5, SIZE_MAX);
-        printf("6..SIZE_MAX: \"%.*s\"\n", (int)v.size, v.buf);
+        printf("6..SIZE_MAX: \"%.*s\"\n", (int)v.len, v.buf);
 
         strFree(&s);
     }
diff --git a/str.h b/str.h
index 52ec7ec..5f2de2c 100644
--- a/str.h
+++ b/str.h
@@ -4,15 +4,17 @@
 extern "C" {
 #endif
 
-#include <stddef.h>
+#include "slice.h"
 #include "strview.h"
 
 #define STR_TESTING
 
-typedef struct {
-    char *buf;
-    size_t len;
-} str_t;
+// typedef struct {
+//     char *buf;
+//     size_t len;
+// } str_t;
+
+typedef slice_t(char *) str_t;
 
 str_t strInit(void);
 str_t strInitStr(const char *cstr);
diff --git a/strstream.c b/strstream.c
index af86381..f238bda 100644
--- a/strstream.c
+++ b/strstream.c
@@ -504,10 +504,10 @@ void ostrAppenddouble(str_ostream_t *ctx, double val) {
 }
 
 void ostrAppendview(str_ostream_t *ctx, strview_t view) {
-    if((ctx->allocated - ctx->size) < view.size) {
-        _ostrRealloc(ctx, view.size + 1);
+    if((ctx->allocated - ctx->size) < view.len) {
+        _ostrRealloc(ctx, view.len + 1);
     }
-    memcpy(ctx->buf + ctx->size, view.buf, view.size);
-    ctx->size += view.size;
+    memcpy(ctx->buf + ctx->size, view.buf, view.len);
+    ctx->size += view.len;
     ctx->buf[ctx->size] = '\0';
 }
\ No newline at end of file
diff --git a/strview.c b/strview.c
index 6952185..ad8a261 100644
--- a/strview.c
+++ b/strview.c
@@ -20,7 +20,7 @@ strview_t strvInit(const char *cstr) {
 strview_t strvInitLen(const char *buf, size_t size) {
     strview_t view;
     view.buf = buf;
-    view.size = size;
+    view.len = size;
     return view;
 }
 
@@ -29,7 +29,7 @@ char strvFront(strview_t ctx) {
 }
 
 char strvBack(strview_t ctx) {
-    return ctx.buf[ctx.size - 1];
+    return ctx.buf[ctx.len - 1];
 }
 
 const char *strvBegin(strview_t *ctx) {
@@ -37,31 +37,31 @@ const char *strvBegin(strview_t *ctx) {
 }
 
 const char *strvEnd(strview_t *ctx) {
-    return ctx->buf + ctx->size;
+    return ctx->buf + ctx->len;
 }
 
 bool strvIsEmpty(strview_t ctx) {
-    return ctx.size == 0;
+    return ctx.len == 0;
 }
 
 void strvRemovePrefix(strview_t *ctx, size_t n) {
     ctx->buf += n;
-    ctx->size -= n;
+    ctx->len -= n;
 }
 
 void strvRemoveSuffix(strview_t *ctx, size_t n) {
-    ctx->size -= n;
+    ctx->len -= n;
 }  
 
 size_t strvCopy(strview_t ctx, char **buf) {
-    *buf = malloc(ctx.size + 1);
-    memcpy(*buf, ctx.buf, ctx.size);
-    (*buf)[ctx.size] = '\0';
-    return ctx.size;
+    *buf = malloc(ctx.len + 1);
+    memcpy(*buf, ctx.buf, ctx.len);
+    (*buf)[ctx.len] = '\0';
+    return ctx.len;
 }
 
 size_t strvCopyN(strview_t ctx, char **buf, size_t count, size_t from) {
-    size_t sz = ctx.size + 1 - from;
+    size_t sz = ctx.len + 1 - from;
     count = min(count, sz);
     *buf = malloc(count + 1);
     memcpy(*buf, ctx.buf + from, count);
@@ -70,7 +70,7 @@ size_t strvCopyN(strview_t ctx, char **buf, size_t count, size_t from) {
 }
 
 size_t strvCopyBuf(strview_t ctx, char *buf, size_t len, size_t from) {
-    size_t sz = ctx.size + 1 - from;
+    size_t sz = ctx.len + 1 - from;
     len = min(len, sz);
     memcpy(buf, ctx.buf + from, len);
     buf[len - 1] = '\0';
@@ -78,21 +78,21 @@ size_t strvCopyBuf(strview_t ctx, char *buf, size_t len, size_t from) {
 }
 
 strview_t strvSubstr(strview_t ctx, size_t from, size_t len) {
-    if(from > ctx.size) from = ctx.size - len;
-    size_t sz = ctx.size - from;
+    if(from > ctx.len) from = ctx.len - len;
+    size_t sz = ctx.len - from;
     return strvInitLen(ctx.buf + from, min(len, sz));
 }
 
 int strvCompare(strview_t ctx, strview_t other) {
-    if(ctx.size < other.size) return -1;
-    if(ctx.size > other.size) return  1;
-    return memcmp(ctx.buf, other.buf, ctx.size);
+    if(ctx.len < other.len) return -1;
+    if(ctx.len > other.len) return  1;
+    return memcmp(ctx.buf, other.buf, ctx.len);
 }
 
 int strvICompare(strview_t ctx, strview_t other) {
-    if(ctx.size < other.size) return -1;
-    if(ctx.size > other.size) return  1;
-    for(size_t i = 0; i < ctx.size; ++i) {
+    if(ctx.len < other.len) return -1;
+    if(ctx.len > other.len) return  1;
+    for(size_t i = 0; i < ctx.len; ++i) {
         char a = tolower(ctx.buf[i]);
         char b = tolower(other.buf[i]);
         if(a != b) return a - b;
@@ -105,8 +105,8 @@ bool strvStartsWith(strview_t ctx, char c) {
 }
 
 bool strvStartsWithView(strview_t ctx, strview_t view) {
-    if(ctx.size < view.size) return false;
-    return memcmp(ctx.buf, view.buf, view.size) == 0;
+    if(ctx.len < view.len) return false;
+    return memcmp(ctx.buf, view.buf, view.len) == 0;
 }
 
 bool strvEndsWith(strview_t ctx, char c) {
@@ -114,45 +114,45 @@ bool strvEndsWith(strview_t ctx, char c) {
 }
 
 bool strvEndsWithView(strview_t ctx, strview_t view) {
-    if(ctx.size < view.size) return false;
-    return memcmp(ctx.buf + ctx.size - view.size, view.buf, view.size) == 0;
+    if(ctx.len < view.len) return false;
+    return memcmp(ctx.buf + ctx.len - view.len, view.buf, view.len) == 0;
 }
 
 bool strvContains(strview_t ctx, char c) {
-    for(size_t i = 0; i < ctx.size; ++i) {
+    for(size_t i = 0; i < ctx.len; ++i) {
         if(ctx.buf[i] == c) return true;
     }
     return false;
 }
 
 bool strvContainsView(strview_t ctx, strview_t view) {
-    if(ctx.size < view.size) return false;
-    size_t end = ctx.size - view.size;
+    if(ctx.len < view.len) return false;
+    size_t end = ctx.len - view.len;
     for(size_t i = 0; i < end; ++i) {
-        if(memcmp(ctx.buf + i, view.buf, view.size) == 0) return true;
+        if(memcmp(ctx.buf + i, view.buf, view.len) == 0) return true;
     }
     return false;
 }
 
 size_t strvFind(strview_t ctx, char c, size_t from) {
-    for(size_t i = from; i < ctx.size; ++i) {
+    for(size_t i = from; i < ctx.len; ++i) {
         if(ctx.buf[i] == c) return i;
     }
     return SIZE_MAX;
 }
 
 size_t strvFindView(strview_t ctx, strview_t view, size_t from) {
-    if(ctx.size < view.size) return SIZE_MAX;
-    size_t end = ctx.size - view.size;
+    if(ctx.len < view.len) return SIZE_MAX;
+    size_t end = ctx.len - view.len;
     for(size_t i = from; i < end; ++i) {
-        if(memcmp(ctx.buf + i, view.buf, view.size) == 0) return i;
+        if(memcmp(ctx.buf + i, view.buf, view.len) == 0) return i;
     }
     return SIZE_MAX;
 }
 
 size_t strvRFind(strview_t ctx, char c, size_t from) {
-    if(from >= ctx.size) {
-        from = ctx.size - 1;
+    if(from >= ctx.len) {
+        from = ctx.len - 1;
     }
 
     const char *buf = ctx.buf + from;
@@ -164,23 +164,23 @@ size_t strvRFind(strview_t ctx, char c, size_t from) {
 }
 
 size_t strvRFindView(strview_t ctx, strview_t view, size_t from) {
-    from = min(from, ctx.size);
+    from = min(from, ctx.len);
 
-    if(view.size > ctx.size) {
-        from -= view.size;
+    if(view.len > ctx.len) {
+        from -= view.len;
     }
 
     const char *buf = ctx.buf + from;
     for(; buf >= ctx.buf; --buf) {
-        if(memcmp(buf, view.buf, view.size) == 0) return (buf - ctx.buf);
+        if(memcmp(buf, view.buf, view.len) == 0) return (buf - ctx.buf);
     }
     return SIZE_MAX;
 }
 
 size_t strvFindFirstOf(strview_t ctx, strview_t view, size_t from) {
-    if(ctx.size < view.size) return SIZE_MAX;
-    for(size_t i = from; i < ctx.size; ++i) {
-        for(size_t j = 0; j < view.size; ++j) {
+    if(ctx.len < view.len) return SIZE_MAX;
+    for(size_t i = from; i < ctx.len; ++i) {
+        for(size_t j = 0; j < view.len; ++j) {
             if(ctx.buf[i] == view.buf[j]) return i;
         }
     }
@@ -188,13 +188,13 @@ size_t strvFindFirstOf(strview_t ctx, strview_t view, size_t from) {
 }
 
 size_t strvFindLastOf(strview_t ctx, strview_t view, size_t from) {
-    if(from >= ctx.size) {
-        from = ctx.size - 1;
+    if(from >= ctx.len) {
+        from = ctx.len - 1;
     }
 
     const char *buf = ctx.buf + from;
     for(; buf >= ctx.buf; --buf) {
-        for(size_t j = 0; j < view.size; ++j) {
+        for(size_t j = 0; j < view.len; ++j) {
             if(*buf == view.buf[j]) return (buf - ctx.buf);
         }
     }
@@ -203,7 +203,7 @@ size_t strvFindLastOf(strview_t ctx, strview_t view, size_t from) {
 }
 
 size_t strvFindFirstNot(strview_t ctx, char c, size_t from) {
-    size_t end = ctx.size - 1;
+    size_t end = ctx.len - 1;
     for(size_t i = from; i < end; ++i) {
         if(ctx.buf[i] != c) return i;
     }
@@ -211,7 +211,7 @@ size_t strvFindFirstNot(strview_t ctx, char c, size_t from) {
 }
 
 size_t strvFindFirstNotOf(strview_t ctx, strview_t view, size_t from) {
-    for(size_t i = from; i < ctx.size; ++i) {
+    for(size_t i = from; i < ctx.len; ++i) {
         if(!strvContains(view, ctx.buf[i])) {
             return i;
         }
@@ -220,8 +220,8 @@ size_t strvFindFirstNotOf(strview_t ctx, strview_t view, size_t from) {
 }
 
 size_t strvFindLastNot(strview_t ctx, char c, size_t from) {
-    if(from >= ctx.size) {
-        from = ctx.size - 1;
+    if(from >= ctx.len) {
+        from = ctx.len - 1;
     }
 
     const char *buf = ctx.buf + from;
@@ -235,8 +235,8 @@ size_t strvFindLastNot(strview_t ctx, char c, size_t from) {
 }
 
 size_t strvFindLastNotOf(strview_t ctx, strview_t view, size_t from) {
-    if(from >= ctx.size) {
-        from = ctx.size - 1;
+    if(from >= ctx.len) {
+        from = ctx.len - 1;
     }
 
     const char *buf = ctx.buf + from;
diff --git a/strview.h b/strview.h
index 8e25fe1..8ca7def 100644
--- a/strview.h
+++ b/strview.h
@@ -9,12 +9,16 @@ extern "C" {
 #include <stddef.h>
 #include <limits.h>
 
+#include "slice.h"
+
 #define STRV_NOT_FOUND SIZE_MAX
 
-typedef struct {
-    const char *buf;
-    size_t size;
-} strview_t;
+// typedef struct {
+//     const char *buf;
+//     size_t size;
+// } strview_t;
+
+typedef slice_t(const char *) strview_t;
 
 strview_t strvInit(const char *cstr);
 strview_t strvInitLen(const char *buf, size_t size);