Move atoi definition in nl_string header, moved MAP_PRIVATE to nl_io header

C/lib/nl_alloc.c

@@ -1,5 +1,5 @@
-#include "nl_alloc.h"
 #include "nl_io.h"
+#include "nl_alloc.h"
 
 #include <stdint.h>
 
@@ -8,13 +8,6 @@
 #define HDR_MAGIC 0xDEAD
 #define MMAP_THRESHOLD (ARENA_SIZE / 2) // 1 MB
 
-#ifndef MAP_PRIVATE
-#define MAP_PRIVATE 0x02
-#endif
-#ifndef MAP_ANONYMOUS
-#define MAP_ANONYMOUS 0x20
-#endif
-
 typedef struct block_hdr {
   size_t size;              // 8
   int free;                 // 4

C/lib/nl_getopt.c

@@ -1,5 +1,6 @@
 #include "nl_getopt.h"
 #include "nl_syscall.h"
+
 #include <stddef.h>
 
 int nl_optind = 1;

C/lib/nl_io.h

@@ -13,6 +13,14 @@
 #ifndef MAP_FAILED
 #define MAP_FAILED ((void *)-1)
 #endif
+#ifndef MAP_PRIVATE
+#define MAP_PRIVATE 0x02
+#endif
+#ifndef MAP_ANONYMOUS
+#define MAP_ANONYMOUS 0x20
+#endif
+
+#include "nl_printf.h"
 #include "nl_syscall.h"
 
 // Basic I/O
@@ -33,6 +41,7 @@ static inline ssize_t nl_read(int fd, void *buf, size_t n) {
   }
   return (ssize_t)ret;
 }
+
 static inline int nl_open(const char *path, int flags, int mode) {
   long ret = __sc3(SYS_open, (long)path, flags, mode);
   if (ret < 0) {
@@ -41,6 +50,7 @@ static inline int nl_open(const char *path, int flags, int mode) {
   }
   return (int)ret;
 }
+
 static inline int nl_close(int fd) {
   long ret = __sc1(SYS_close, fd);
   if (ret < 0) {
@@ -49,6 +59,7 @@ static inline int nl_close(int fd) {
   }
   return 0;
 }
+
 static inline int nl_unlink(const char *path) {
   long ret = __sc1(SYS_unlink, (long)path);
   if (ret < 0) {
@@ -57,6 +68,7 @@ static inline int nl_unlink(const char *path) {
   }
   return (int)ret;
 }
+
 static inline int nl_ioctl(int fd, unsigned long req, void *arg) {
   long ret = __sc3(SYS_ioctl, fd, (long)req, (long)arg);
   if (ret < 0) {
@@ -89,6 +101,7 @@ static inline void *nl_mmap(void *addr, size_t len, int prot, int flags, int fd,
   }
   return (void *)ret;
 }
+
 static inline int nl_munmap(void *addr, size_t len) {
   long ret = __sc2(SYS_munmap, (long)addr, (long)len);
   if (ret < 0) {
@@ -129,6 +142,7 @@ static inline int nl_select(int nfds, nl_fd_set *r, nl_fd_set *w, nl_fd_set *e,
 static inline int nl_clock_gettime(clockid_t id, struct timespec *ts) {
   return (int)__sc2(SYS_clock_gettime, id, (long)ts);
 }
+
 static inline int nl_nanosleep(const struct timespec *req,
                                struct timespec *rem) {
   long ret = __sc2(SYS_nanosleep, (long)req, (long)rem);
@@ -138,11 +152,21 @@ static inline int nl_nanosleep(const struct timespec *req,
   }
   return 0;
 }
+
 static inline void nl_usleep(unsigned long us) {
   struct timespec ts = {(long)(us / 1000000), (long)((us % 1000000) * 1000)};
   nl_nanosleep(&ts, (struct timespec *)0);
 }
-static inline long nl_time(void) { return (long)__sc1(SYS_time, 0); }
+
+static inline long nl_time(void) {
+  long ret = __sc1(SYS_time, 0);
+  if (ret < 0) {
+    errno = (int)-ret;
+    return -1;
+  }
+  return ret;
+}
+
 static inline void nl_exit(int code) {
   __sc1(SYS_exit_group, code);
   __builtin_unreachable();

C/lib/nl_printf.c

@@ -167,4 +167,6 @@ int nl_snprintf(char *buf, size_t size, const char *fmt, ...) {
   return r;
 }
 
-void nl_eprint(const char *msg) { nl_write(2, msg, nl_strlen(msg)); }
+void nl_eprint(const char *msg) {
+  nl_write(2, msg, nl_strlen(msg));
+}

C/lib/nl_string.h

@@ -77,6 +77,17 @@ static inline char *nl_dirname(char *path) {
   return path;
 }
 
+static inline int nl_atoi(const char *s) {
+  int n = 0, neg = 0;
+  if (*s == '-') {
+    neg = 1;
+    s++;
+  }
+  while (*s >= '0' && *s <= '9')
+    n = n * 10 + (*s++ - '0');
+  return neg ? -n : n;
+}
+
 #define strlen(s) nl_strlen(s)
 #define memcpy(d, s, n) nl_memcpy(d, s, n)
 #define memset(d, c, n) nl_memset(d, c, n)
@@ -84,5 +95,6 @@ static inline char *nl_dirname(char *path) {
 #define strncpy(d, s, n) nl_strncpy_safe(d, s, n)
 #define basename(p) nl_basename(p)
 #define dirname(p) nl_dirname(p)
+// #define atoi(s) nl_atoi(s)
 
 #endif

C/src/capture_linux.c

@@ -20,6 +20,7 @@ struct webcam_impl {
 static webcam_impl_t _impl_storage;
 
 int webcam_init(webcam_t *cam, const char *device, int width, int height) {
+  nl_memset(&_impl_storage, 0, sizeof(_impl_storage));
   cam->impl = &_impl_storage;
   cam->buffer = MAP_FAILED;
 
@@ -172,8 +173,6 @@ int webcam_set_auto_exposure(webcam_t *cam, int enable) {
     return -1;
   // NOTE: UVC drivers expose V4L2_CID_EXPOSURE_AUTO as a menu (0=manual,
   // 1=aperture priority, 3=auto, driver-dependent which subset exists).
-  // Some webcam drivers instead/also expose the simpler boolean
-  // V4L2_CID_AUTOGAIN. Try the proper one first, fall back to the boolean.
   if (v4l2_set_value(cam->fd, V4L2_CID_EXPOSURE_AUTO,
                      enable ? V4L2_EXPOSURE_AUTO : V4L2_EXPOSURE_MANUAL) == 0)
     return 0;

README.md

@@ -28,9 +28,9 @@ Real-time ASCII video from your webcam in the terminal - pure C99, no heavy runt
 | **Hardware camera controls**  | V4L2 exposure, contrast, white-balance via `ioctl` — live keys `e`/`E`, `c`/`C`, `w`/`W` (Linux only; macOS/Windows display `n/a`) |
 | **Cross‑platform**            | Linux (V4L2, nolibc), macOS (AVFoundation, system libc), Windows (Media Foundation)                                                |
 
-Linux: requires `gcc`, `linux/videodev2.h` (kernel headers), `libdl`, `libpthread`.
-macOS: requires `Clang` and `AVFoundation` frameworks (linked automatically).
-Windows: requires MinGW-w64; links `mfplat`, `mf`, `mfreadwrite`, `mfuuid`, `ole32` (Media Foundation). See Makefile `windows` branch.
+- Linux: requires `gcc`, `linux/videodev2.h` (kernel headers), `libdl`, `libpthread`.
+- macOS: requires `Clang` and `AVFoundation` frameworks (linked automatically).
+- Windows: requires `MinGW-w64`; links `mfplat`, `mf`, `mfreadwrite`, `mfuuid`, `ole32` (Media Foundation).
 
 No other external dependencies.
 
@@ -42,12 +42,7 @@ No other external dependencies.
 git clone https://github.com/Harshit-Dhanwalkar/AsciiCam.git
 cd AsciiCam/C/
 make
-```
 
-Requires: `gcc`, `linux/videodev2.h` (kernel headers), `libdl`, `libpthread`.
-No other external dependencies.
-
-```
 build/webcam_ascii --help
 ```
 
@@ -96,8 +91,8 @@ gcc -O2 -fPIC -shared -Iinclude filters/my_filter.c -o build/my_filter.so
 | `w` / `W` | hw white-balance down / up _(V4L2, Linux only)_ |
 | `c` / `C` | hw contrast down / up _(V4L2, Linux only)_ |
 | `↑` / `↓` | select plugin |
-| `[` / `]` | param $\pm$1 |
-| `{` / `}` | param $\pm$10 |
+| `[` / `]` | param ± 1 |
+| `{` / `}` | param ± 10 |
 | `r` | reset param to 128 |
 | `q` | quit |