Improve file API

Prefix function names and improve documentation.

app/meson.build

@@ -24,19 +24,27 @@ src = [
     'src/server.c',
     'src/stream.c',
     'src/video_buffer.c',
+    'src/util/file.c',
     'src/util/log.c',
     'src/util/net.c',
     'src/util/process.c',
     'src/util/strbuf.c',
     'src/util/str_util.c',
+    'src/util/term.c',
     'src/util/thread.c',
     'src/util/tick.c',
 ]
 
 if host_machine.system() == 'windows'
-    src += [ 'src/sys/win/process.c' ]
+    src += [
+        'src/sys/win/file.c',
+        'src/sys/win/process.c',
+    ]
 else
-    src += [ 'src/sys/unix/process.c' ]
+    src += [
+        'src/sys/unix/file.c',
+        'src/sys/unix/process.c',
+    ]
 endif
 
 v4l2_support = host_machine.system() == 'linux'
@@ -189,6 +197,7 @@ if get_option('buildtype') == 'debug'
             'src/options.c',
             'src/util/strbuf.c',
             'src/util/str_util.c',
+            'src/util/term.c',
         ]],
         ['test_clock', [
             'tests/test_clock.c',

app/src/adb.c

@@ -5,6 +5,7 @@
 #include <stdlib.h>
 #include <string.h>
 
+#include "util/file.h"
 #include "util/log.h"
 #include "util/str_util.h"
 
@@ -68,7 +69,7 @@ show_adb_installation_msg() {
         {"pacman", "pacman -S android-tools"},
     };
     for (size_t i = 0; i < ARRAY_LEN(pkg_managers); ++i) {
-        if (search_executable(pkg_managers[i].binary)) {
+        if (sc_file_executable_exists(pkg_managers[i].binary)) {
             LOGI("You may install 'adb' by \"%s\"", pkg_managers[i].command);
             return;
         }

app/src/cli.c

@@ -4,12 +4,14 @@
 #include <getopt.h>
 #include <stdint.h>
 #include <stdio.h>
+#include <stdlib.h>
 #include <unistd.h>
 
 #include "options.h"
 #include "util/log.h"
 #include "util/strbuf.h"
 #include "util/str_util.h"
+#include "util/term.h"
 
 #define STR_IMPL_(x) #x
 #define STR(x) STR_IMPL_(x)
@@ -312,7 +314,7 @@ static const struct sc_option options[] = {
                 "\"lsuper\" and \"rsuper\".\n"
                 "A shortcut can consist in several keys, separated by '+'. "
                 "Several shortcuts can be specified, separated by ','.\n"
-                "For example, to use either LCtrl+LAlt or LSuper for scrcpy\n"
+                "For example, to use either LCtrl+LAlt or LSuper for scrcpy "
                 "shortcuts, pass \"lctrl+lalt,lsuper\".\n"
                 "Default is \"lalt,lsuper\" (left-Alt or left-Super).",
     },
@@ -633,7 +635,6 @@ print_option_usage_header(const struct sc_option *opt) {
         ok = sc_strbuf_append_char(&buf, '-');
         assert(ok);
 
-
         ok = sc_strbuf_append_char(&buf, opt->shortopt);
         assert(ok);
 
@@ -680,7 +681,7 @@ error:
 
 static void
 print_option_usage(const struct sc_option *opt, unsigned cols) {
-    assert(cols > 20); // We need some space
+    assert(cols > 8); // sc_str_wrap_lines() requires indent < columns
 
     if (!opt->text) {
         // Option not documented in help (for example because it is deprecated)
@@ -689,7 +690,7 @@ print_option_usage(const struct sc_option *opt, unsigned cols) {
 
     print_option_usage_header(opt);
 
-    char *text = wrap_lines(opt->text, cols, 8);
+    char *text = sc_str_wrap_lines(opt->text, cols, 8);
     if (!text) {
         fprintf(stderr, "<ERROR>\n");
         return;
@@ -701,7 +702,7 @@ print_option_usage(const struct sc_option *opt, unsigned cols) {
 
 static void
 print_shortcuts_intro(unsigned cols) {
-    char *intro = wrap_lines(
+    char *intro = sc_str_wrap_lines(
         "In the following list, MOD is the shortcut modifier. By default, it's "
         "(left) Alt or (left) Super, but it can be configured by "
         "--shortcut-mod (see above).", cols, 4);
@@ -716,7 +717,7 @@ print_shortcuts_intro(unsigned cols) {
 
 static void
 print_shortcut(const struct sc_shortcut *shortcut, unsigned cols) {
-    assert(cols > 20); // We need some space
+    assert(cols > 8); // sc_str_wrap_lines() requires indent < columns
     assert(shortcut->shortcuts[0]); // At least one shortcut
     assert(shortcut->text);
 
@@ -728,7 +729,7 @@ print_shortcut(const struct sc_shortcut *shortcut, unsigned cols) {
         ++i;
     };
 
-    char *text = wrap_lines(shortcut->text, cols, 8);
+    char *text = sc_str_wrap_lines(shortcut->text, cols, 8);
     if (!text) {
         fprintf(stderr, "<ERROR>\n");
         return;
@@ -740,17 +741,35 @@ print_shortcut(const struct sc_shortcut *shortcut, unsigned cols) {
 
 void
 scrcpy_print_usage(const char *arg0) {
+#define SC_TERM_COLS_DEFAULT 80
+    unsigned cols;
+
+    if (!isatty(STDERR_FILENO)) {
+        // Not a tty
+        cols = SC_TERM_COLS_DEFAULT;
+    } else {
+        bool ok = sc_term_get_size(NULL, &cols);
+        if (!ok) {
+            // Could not get the terminal size
+            cols = SC_TERM_COLS_DEFAULT;
+        }
+        if (cols < 20) {
+            // Do not accept a too small value
+            cols = 20;
+        }
+    }
+
     fprintf(stderr, "Usage: %s [options]\n\n"
                     "Options:\n", arg0);
     for (size_t i = 0; i < ARRAY_LEN(options); ++i) {
-        print_option_usage(&options[i], 80);
+        print_option_usage(&options[i], cols);
     }
 
     // Print shortcuts section
     fprintf(stderr, "\nShortcuts:\n\n");
-    print_shortcuts_intro(80);
+    print_shortcuts_intro(cols);
     for (size_t i = 0; i < ARRAY_LEN(shortcuts); ++i) {
-        print_shortcut(&shortcuts[i], 80);
+        print_shortcut(&shortcuts[i], cols);
     }
 }
 

app/src/icon.c

@@ -8,8 +8,8 @@
 
 #include "config.h"
 #include "compat.h"
+#include "util/file.h"
 #include "util/log.h"
-#include "util/process.h"
 #include "util/str_util.h"
 
 #define SCRCPY_PORTABLE_ICON_FILENAME "icon.png"
@@ -46,7 +46,7 @@ get_icon_path(void) {
         return NULL;
     }
 #else
-    char *icon_path = get_local_file_path(SCRCPY_PORTABLE_ICON_FILENAME);
+    char *icon_path = sc_file_get_local_path(SCRCPY_PORTABLE_ICON_FILENAME);
     if (!icon_path) {
         LOGE("Could not get icon path");
         return NULL;

app/src/server.c

@@ -8,6 +8,7 @@
 #include <SDL2/SDL_platform.h>
 
 #include "adb.h"
+#include "util/file.h"
 #include "util/log.h"
 #include "util/net.h"
 #include "util/str_util.h"
@@ -48,7 +49,7 @@ get_server_path(void) {
         return NULL;
     }
 #else
-    char *server_path = get_local_file_path(SERVER_FILENAME);
+    char *server_path = sc_file_get_local_path(SERVER_FILENAME);
     if (!server_path) {
         LOGE("Could not get local file path, "
              "using " SERVER_FILENAME " from current directory");
@@ -67,7 +68,7 @@ push_server(const char *serial) {
     if (!server_path) {
         return false;
     }
-    if (!is_regular_file(server_path)) {
+    if (!sc_file_is_regular(server_path)) {
         LOGE("'%s' does not exist or is not a regular file\n", server_path);
         free(server_path);
         return false;

app/src/sys/unix/file.c

@@ -0,0 +1,75 @@
+#include "util/file.h"
+
+#include <limits.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <unistd.h>
+
+bool
+sc_file_executable_exists(const char *file) {
+    char *path = getenv("PATH");
+    if (!path)
+        return false;
+    path = strdup(path);
+    if (!path)
+        return false;
+
+    bool ret = false;
+    size_t file_len = strlen(file);
+    char *saveptr;
+    for (char *dir = strtok_r(path, ":", &saveptr); dir;
+            dir = strtok_r(NULL, ":", &saveptr)) {
+        size_t dir_len = strlen(dir);
+        char *fullpath = malloc(dir_len + file_len + 2);
+        if (!fullpath)
+            continue;
+        memcpy(fullpath, dir, dir_len);
+        fullpath[dir_len] = '/';
+        memcpy(fullpath + dir_len + 1, file, file_len + 1);
+
+        struct stat sb;
+        bool fullpath_executable = stat(fullpath, &sb) == 0 &&
+            sb.st_mode & S_IXUSR;
+        free(fullpath);
+        if (fullpath_executable) {
+            ret = true;
+            break;
+        }
+    }
+
+    free(path);
+    return ret;
+}
+
+char *
+sc_file_get_executable_path(void) {
+// <https://stackoverflow.com/a/1024937/1987178>
+#ifdef __linux__
+    char buf[PATH_MAX + 1]; // +1 for the null byte
+    ssize_t len = readlink("/proc/self/exe", buf, PATH_MAX);
+    if (len == -1) {
+        perror("readlink");
+        return NULL;
+    }
+    buf[len] = '\0';
+    return strdup(buf);
+#else
+    // in practice, we only need this feature for portable builds, only used on
+    // Windows, so we don't care implementing it for every platform
+    // (it's useful to have a working version on Linux for debugging though)
+    return NULL;
+#endif
+}
+
+bool
+sc_file_is_regular(const char *path) {
+    struct stat path_stat;
+
+    if (stat(path, &path_stat)) {
+        perror("stat");
+        return false;
+    }
+    return S_ISREG(path_stat.st_mode);
+}
+

app/src/sys/unix/process.c

@@ -3,53 +3,13 @@
 #include <assert.h>
 #include <errno.h>
 #include <fcntl.h>
-#include <limits.h>
 #include <signal.h>
-#include <stdlib.h>
-#include <string.h>
-#include <sys/stat.h>
 #include <sys/types.h>
 #include <sys/wait.h>
 #include <unistd.h>
 
 #include "util/log.h"
 
-bool
-search_executable(const char *file) {
-    char *path = getenv("PATH");
-    if (!path)
-        return false;
-    path = strdup(path);
-    if (!path)
-        return false;
-
-    bool ret = false;
-    size_t file_len = strlen(file);
-    char *saveptr;
-    for (char *dir = strtok_r(path, ":", &saveptr); dir;
-            dir = strtok_r(NULL, ":", &saveptr)) {
-        size_t dir_len = strlen(dir);
-        char *fullpath = malloc(dir_len + file_len + 2);
-        if (!fullpath)
-            continue;
-        memcpy(fullpath, dir, dir_len);
-        fullpath[dir_len] = '/';
-        memcpy(fullpath + dir_len + 1, file, file_len + 1);
-
-        struct stat sb;
-        bool fullpath_executable = stat(fullpath, &sb) == 0 &&
-            sb.st_mode & S_IXUSR;
-        free(fullpath);
-        if (fullpath_executable) {
-            ret = true;
-            break;
-        }
-    }
-
-    free(path);
-    return ret;
-}
-
 enum process_result
 process_execute_redirect(const char *const argv[], pid_t *pid, int *pipe_stdin,
                      int *pipe_stdout, int *pipe_stderr) {
@@ -232,37 +192,6 @@ process_close(pid_t pid) {
     process_wait(pid, true); // ignore exit code
 }
 
-char *
-get_executable_path(void) {
-// <https://stackoverflow.com/a/1024937/1987178>
-#ifdef __linux__
-    char buf[PATH_MAX + 1]; // +1 for the null byte
-    ssize_t len = readlink("/proc/self/exe", buf, PATH_MAX);
-    if (len == -1) {
-        perror("readlink");
-        return NULL;
-    }
-    buf[len] = '\0';
-    return strdup(buf);
-#else
-    // in practice, we only need this feature for portable builds, only used on
-    // Windows, so we don't care implementing it for every platform
-    // (it's useful to have a working version on Linux for debugging though)
-    return NULL;
-#endif
-}
-
-bool
-is_regular_file(const char *path) {
-    struct stat path_stat;
-
-    if (stat(path, &path_stat)) {
-        perror("stat");
-        return false;
-    }
-    return S_ISREG(path_stat.st_mode);
-}
-
 ssize_t
 read_pipe(int pipe, char *data, size_t len) {
     return read(pipe, data, len);

app/src/sys/win/file.c

@@ -0,0 +1,43 @@
+#include "util/file.h"
+
+#include <windows.h>
+
+#include <sys/stat.h>
+
+#include "util/log.h"
+#include "util/str_util.h"
+
+char *
+sc_file_get_executable_path(void) {
+    HMODULE hModule = GetModuleHandleW(NULL);
+    if (!hModule) {
+        return NULL;
+    }
+    WCHAR buf[MAX_PATH + 1]; // +1 for the null byte
+    int len = GetModuleFileNameW(hModule, buf, MAX_PATH);
+    if (!len) {
+        return NULL;
+    }
+    buf[len] = '\0';
+    return utf8_from_wide_char(buf);
+}
+
+bool
+sc_file_is_regular(const char *path) {
+    wchar_t *wide_path = utf8_to_wide_char(path);
+    if (!wide_path) {
+        LOGC("Could not allocate wide char string");
+        return false;
+    }
+
+    struct _stat path_stat;
+    int r = _wstat(wide_path, &path_stat);
+    free(wide_path);
+
+    if (r) {
+        perror("stat");
+        return false;
+    }
+    return S_ISREG(path_stat.st_mode);
+}
+

app/src/sys/win/process.c

@@ -1,7 +1,6 @@
 #include "util/process.h"
 
 #include <assert.h>
-#include <sys/stat.h>
 
 #include "util/log.h"
 #include "util/str_util.h"
@@ -174,40 +173,6 @@ process_close(HANDLE handle) {
     (void) closed;
 }
 
-char *
-get_executable_path(void) {
-    HMODULE hModule = GetModuleHandleW(NULL);
-    if (!hModule) {
-        return NULL;
-    }
-    WCHAR buf[MAX_PATH + 1]; // +1 for the null byte
-    int len = GetModuleFileNameW(hModule, buf, MAX_PATH);
-    if (!len) {
-        return NULL;
-    }
-    buf[len] = '\0';
-    return utf8_from_wide_char(buf);
-}
-
-bool
-is_regular_file(const char *path) {
-    wchar_t *wide_path = utf8_to_wide_char(path);
-    if (!wide_path) {
-        LOGC("Could not allocate wide char string");
-        return false;
-    }
-
-    struct _stat path_stat;
-    int r = _wstat(wide_path, &path_stat);
-    free(wide_path);
-
-    if (r) {
-        perror("stat");
-        return false;
-    }
-    return S_ISREG(path_stat.st_mode);
-}
-
 ssize_t
 read_pipe(HANDLE pipe, char *data, size_t len) {
     DWORD r;

app/src/util/file.c

@@ -0,0 +1,48 @@
+#include "file.h"
+
+#include <stdlib.h>
+#include <string.h>
+
+#include "util/log.h"
+
+char *
+sc_file_get_local_path(const char *name) {
+    char *executable_path = sc_file_get_executable_path();
+    if (!executable_path) {
+        return NULL;
+    }
+
+    // dirname() does not work correctly everywhere, so get the parent
+    // directory manually.
+    // See <https://github.com/Genymobile/scrcpy/issues/2619>
+    char *p = strrchr(executable_path, SC_PATH_SEPARATOR);
+    if (!p) {
+        LOGE("Unexpected executable path: \"%s\" (it should contain a '%c')",
+             executable_path, SC_PATH_SEPARATOR);
+        free(executable_path);
+        return NULL;
+    }
+
+    *p = '\0'; // modify executable_path in place
+    char *dir = executable_path;
+    size_t dirlen = strlen(dir);
+    size_t namelen = strlen(name);
+
+    size_t len = dirlen + namelen + 2; // +2: '/' and '\0'
+    char *file_path = malloc(len);
+    if (!file_path) {
+        LOGE("Could not alloc path");
+        free(executable_path);
+        return NULL;
+    }
+
+    memcpy(file_path, dir, dirlen);
+    file_path[dirlen] = SC_PATH_SEPARATOR;
+    // namelen + 1 to copy the final '\0'
+    memcpy(&file_path[dirlen + 1], name, namelen + 1);
+
+    free(executable_path);
+
+    return file_path;
+}
+

app/src/util/file.h

@@ -0,0 +1,49 @@
+#ifndef SC_FILE_H
+#define SC_FILE_H
+
+#include "common.h"
+
+#include <stdbool.h>
+
+#ifdef _WIN32
+# define SC_PATH_SEPARATOR '\\'
+#else
+# define SC_PATH_SEPARATOR '/'
+#endif
+
+#ifndef _WIN32
+/**
+ * Indicate if an executable exists using $PATH
+ *
+ * In practice, it is only used to know if a package manager is available on
+ * the system. It is only implemented on Linux.
+ */
+bool
+sc_file_executable_exists(const char *file);
+#endif
+
+/**
+ * Return the absolute path of the executable (the scrcpy binary)
+ *
+ * The result must be freed by the caller using free(). It may return NULL on
+ * error.
+ */
+char *
+sc_file_get_executable_path(void);
+
+/**
+ * Return the absolute path of a file in the same directory as the executable
+ *
+ * The result must be freed by the caller using free(). It may return NULL on
+ * error.
+ */
+char *
+sc_file_get_local_path(const char *name);
+
+/**
+ * Indicate if the file exists and is not a directory
+ */
+bool
+sc_file_is_regular(const char *path);
+
+#endif

app/src/util/process.c

@@ -21,47 +21,6 @@ process_check_success(process_t proc, const char *name, bool close) {
     return true;
 }
 
-char *
-get_local_file_path(const char *name) {
-    char *executable_path = get_executable_path();
-    if (!executable_path) {
-        return NULL;
-    }
-
-    // dirname() does not work correctly everywhere, so get the parent
-    // directory manually.
-    // See <https://github.com/Genymobile/scrcpy/issues/2619>
-    char *p = strrchr(executable_path, PATH_SEPARATOR);
-    if (!p) {
-        LOGE("Unexpected executable path: \"%s\" (it should contain a '%c')",
-             executable_path, PATH_SEPARATOR);
-        free(executable_path);
-        return NULL;
-    }
-
-    *p = '\0'; // modify executable_path in place
-    char *dir = executable_path;
-    size_t dirlen = strlen(dir);
-    size_t namelen = strlen(name);
-
-    size_t len = dirlen + namelen + 2; // +2: '/' and '\0'
-    char *file_path = malloc(len);
-    if (!file_path) {
-        LOGE("Could not alloc path");
-        free(executable_path);
-        return NULL;
-    }
-
-    memcpy(file_path, dir, dirlen);
-    file_path[dirlen] = PATH_SEPARATOR;
-    // namelen + 1 to copy the final '\0'
-    memcpy(&file_path[dirlen + 1], name, namelen + 1);
-
-    free(executable_path);
-
-    return file_path;
-}
-
 ssize_t
 read_pipe_all(pipe_t pipe, char *data, size_t len) {
     size_t copied = 0;

app/src/util/process.h

@@ -10,7 +10,6 @@
  // not needed here, but winsock2.h must never be included AFTER windows.h
 # include <winsock2.h>
 # include <windows.h>
-# define PATH_SEPARATOR '\\'
 # define PRIexitcode "lu"
 // <https://stackoverflow.com/a/44383330/1987178>
 # define PRIsizet "Iu"
@@ -23,7 +22,6 @@
 #else
 
 # include <sys/types.h>
-# define PATH_SEPARATOR '/'
 # define PRIsizet "zu"
 # define PRIexitcode "d"
 # define PROCESS_NONE -1
@@ -73,26 +71,6 @@ process_close(process_t pid);
 bool
 process_check_success(process_t proc, const char *name, bool close);
 
-#ifndef _WIN32
-// only used to find package manager, not implemented for Windows
-bool
-search_executable(const char *file);
-#endif
-
-// return the absolute path of the executable (the scrcpy binary)
-// may be NULL on error; to be freed by free()
-char *
-get_executable_path(void);
-
-// Return the absolute path of a file in the same directory as he executable.
-// May be NULL on error. To be freed by free().
-char *
-get_local_file_path(const char *name);
-
-// returns true if the file exists and is not a directory
-bool
-is_regular_file(const char *path);
-
 ssize_t
 read_pipe(pipe_t pipe, char *data, size_t len);
 

app/src/util/str_util.c

@@ -212,20 +212,20 @@ utf8_from_wide_char(const wchar_t *ws) {
 
 #endif
 
-char *wrap_lines(const char *input, unsigned columns, unsigned indent) {
+char *sc_str_wrap_lines(const char *input, unsigned columns, unsigned indent) {
+    assert(indent < columns);
+
     struct sc_strbuf buf;
 
-    // The output string should not be a lot longer than the input string (just
-    // a few '\n' added), so this initial capacity should almost always avoid
-    // internal realloc() in string buffer
+    // The output string should not be much longer than the input string (just
+    // a few '\n' added), so this initial capacity should hopefully almost
+    // always avoid internal realloc() in string buffer
     size_t cap = strlen(input) * 3 / 2;
 
     if (!sc_strbuf_init(&buf, cap)) {
         return false;
     }
 
-    assert(indent < columns);
-
 #define APPEND(S,N) if (!sc_strbuf_append(&buf, S, N)) goto error
 #define APPEND_CHAR(C) if (!sc_strbuf_append_char(&buf, C)) goto error
 #define APPEND_N(C,N) if (!sc_strbuf_append_n(&buf, C, N)) goto error
@@ -241,7 +241,12 @@ char *wrap_lines(const char *input, unsigned columns, unsigned indent) {
     size_t col = indent;
     while (*input) {
         size_t sep_idx = strcspn(input, "\n ");
-        bool wrap = col + sep_idx > columns;
+        size_t new_col = col + sep_idx;
+        if (pending == ' ') {
+            // The pending space counts
+            ++new_col;
+        }
+        bool wrap = new_col > columns;
 
         char sep = input[sep_idx];
         if (sep == ' ')

app/src/util/str_util.h

@@ -62,8 +62,12 @@ char *
 utf8_from_wide_char(const wchar_t *s);
 #endif
 
-// Wrap input lines at words boundaries (spaces) so that they fit in 'columns'
-// columns, left-indented by 'indent' spaces
-char *wrap_lines(const char *input, unsigned columns, unsigned indent);
+/**
+ * Wrap input lines to fit in `columns` columns
+ *
+ * Break input lines at word boundaries (spaces) so that they fit in `columns`
+ * columns, left-indented by `indent` spaces.
+ */
+char *sc_str_wrap_lines(const char *input, unsigned columns, unsigned indent);
 
 #endif

app/src/util/strbuf.h

@@ -1,6 +1,8 @@
 #ifndef SC_STRBUF_H
 #define SC_STRBUF_H
 
+#include "common.h"
+
 #include <stdbool.h>
 #include <stddef.h>
 #include <string.h>
@@ -11,29 +13,60 @@ struct sc_strbuf {
     size_t cap;
 };
 
-// buf->s must be manually freed by the caller
+/**
+ * Initialize the string buffer
+ *
+ * `buf->s` must be manually freed by the caller.
+ */
 bool
 sc_strbuf_init(struct sc_strbuf *buf, size_t init_cap);
 
+/**
+ * Append a string
+ *
+ * Append `len` characters from `s` to the buffer.
+ */
 bool
 sc_strbuf_append(struct sc_strbuf *buf, const char *s, size_t len);
 
+/**
+ * Append a char
+ *
+ * Append a single character to the buffer.
+ */
 bool
 sc_strbuf_append_char(struct sc_strbuf *buf, const char c);
 
+/**
+ * Append a char `n` times
+ *
+ * Append the same characters `n` times to the buffer.
+ */
 bool
 sc_strbuf_append_n(struct sc_strbuf *buf, const char c, size_t n);
 
+/**
+ * Append a NUL-terminated string
+ */
 static inline bool
 sc_strbuf_append_str(struct sc_strbuf *buf, const char *s) {
     return sc_strbuf_append(buf, s, strlen(s));
 }
 
-// Append static string (i.e. the string size is known at compile time, for
-// example a string literal)
+/**
+ * Append a static string
+ *
+ * Append a string whose size is known at compile time (for
+ * example a string literal).
+ */
 #define sc_strbuf_append_staticstr(BUF, S) \
     sc_strbuf_append(BUF, S, sizeof(S) - 1)
 
+/**
+ * Shrink the buffer capacity to its current length
+ *
+ * This resizes `buf->s` to fit the content.
+ */
 void
 sc_strbuf_shrink(struct sc_strbuf *buf);
 

app/src/util/term.c

@@ -0,0 +1,51 @@
+#include "term.h"
+
+#include <assert.h>
+
+#ifdef _WIN32
+# include <windows.h>
+#else
+# include <unistd.h>
+# include <sys/ioctl.h>
+#endif
+
+bool
+sc_term_get_size(unsigned *rows, unsigned *cols) {
+#ifdef _WIN32
+    CONSOLE_SCREEN_BUFFER_INFO csbi;
+
+    bool ok =
+        GetConsoleScreenBufferInfo(GetStdHandle(STD_OUTPUT_HANDLE), &csbi);
+    if (!ok) {
+        return false;
+    }
+
+    if (rows) {
+        assert(csbi.srWindow.Bottom >= csbi.srWindow.Top);
+        *rows = csbi.srWindow.Bottom - csbi.srWindow.Top + 1;
+    }
+
+    if (cols) {
+        assert(csbi.srWindow.Right >= csbi.srWindow.Left);
+        *cols = csbi.srWindow.Right - csbi.srWindow.Left + 1;
+    }
+
+    return true;
+#else
+    struct winsize ws;
+    int r = ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws);
+    if (r == -1) {
+        return false;
+    }
+
+    if (rows) {
+        *rows = ws.ws_row;
+    }
+
+    if (cols) {
+        *cols = ws.ws_col;
+    }
+
+    return true;
+#endif
+}

app/src/util/term.h

@@ -0,0 +1,21 @@
+#ifndef SC_TERM_H
+#define SC_TERM_H
+
+#include "common.h"
+
+#include <stdbool.h>
+
+/**
+ * Return the terminal dimensions
+ *
+ * Return false if the dimensions could not be retrieved.
+ *
+ * Otherwise, return true, and:
+ *  - if `rows` is not NULL, then the number of rows is written to `*rows`.
+ *  - if `columns` is not NULL, then the number of columns is written to
+ *    `*columns`.
+ */
+bool
+sc_term_get_size(unsigned *rows, unsigned *cols);
+
+#endif

app/tests/test_strutil.c

@@ -301,7 +301,7 @@ static void test_strlist_contains(void) {
 
 static void test_wrap_lines(void) {
     const char *s = "This is a text to test line wrapping. The lines must be "
-                    "wrapped either at a space or a line break.\n"
+                    "wrapped at a space or a line break.\n"
                     "\n"
                     "This rectangle must remains a rectangle because it is "
                     "drawn in lines having lengths lower than the specified "
@@ -315,9 +315,8 @@ static void test_wrap_lines(void) {
     const char *expected = "    This is a text to\n"
                            "    test line wrapping.\n"
                            "    The lines must be\n"
-                           "    wrapped either at a\n"
-                           "    space or a line\n"
-                           "    break.\n"
+                           "    wrapped at a space\n"
+                           "    or a line break.\n"
                            "    \n"
                            "    This rectangle must\n"
                            "    remains a rectangle\n"
@@ -330,7 +329,7 @@ static void test_wrap_lines(void) {
                            "      |    |\n"
                            "      +----+\n";
 
-    char *formatted = wrap_lines(s, 24, 4);
+    char *formatted = sc_str_wrap_lines(s, 24, 4);
     assert(formatted);
 
     assert(!strcmp(formatted, expected));