ref: cd31f04c284d181a428816a71bbfbf0eaded4fb9
dir: /sysmisc.c/
#include "sysmisc.h"
#include "gbuffer.h"
#include "oso.h"
#include <ctype.h>
#include <errno.h>
#include <sys/stat.h>
static char const *const xdg_config_home_env = "XDG_CONFIG_HOME";
static char const *const home_env = "HOME";
void expand_home_tilde(oso **path) {
oso *s = *path;
size_t n = osolen(s);
if (n < 2)
return;
if (osoc(s)[0] != '~' || osoc(s)[1] != '/')
return;
char const *homedir = getenv(home_env);
if (!homedir)
return;
size_t hlen = strlen(homedir);
osoensurecap(&s, n + hlen - 1);
if (!s)
goto done;
memmove((char *)s + hlen, (char *)s + 1, n); // includes '\0'
memcpy((char *)s, homedir, hlen);
osopokelen(s, n + hlen - 1);
done:
*path = s;
}
ORCA_NOINLINE
Cboard_error cboard_copy(Glyph const *gbuffer, Usz field_height,
Usz field_width, Usz rect_y, Usz rect_x, Usz rect_h,
Usz rect_w) {
(void)field_height;
FILE *fp =
#ifdef ORCA_OS_MAC
popen("pbcopy -pboard general 2>/dev/null", "w");
#else
popen("xclip -i -selection clipboard 2>/dev/null", "w");
#endif
if (!fp)
return Cboard_error_popen_failed;
for (Usz iy = 0; iy < rect_h; iy++) {
Glyph const *row = gbuffer + (rect_y + iy) * field_width + rect_x;
fwrite(row, sizeof(Glyph), rect_w, fp);
if (iy + 1 < rect_h)
fputc('\n', fp);
}
int status = pclose(fp);
return status ? Cboard_error_process_exit_error : Cboard_error_none;
}
ORCA_NOINLINE
Cboard_error cboard_paste(Glyph *gbuffer, Usz height, Usz width, Usz y, Usz x,
Usz *out_h, Usz *out_w) {
FILE *fp =
#ifdef ORCA_OS_MAC
popen("pbpaste -pboard general -Prefer txt 2>/dev/null", "r");
#else
popen("xclip -o -selection clipboard 2>/dev/null", "r");
#endif
Usz start_y = y, start_x = x, max_y = y, max_x = x;
if (!fp)
return Cboard_error_popen_failed;
char inbuff[512];
for (;;) {
size_t n = fread(inbuff, 1, sizeof inbuff, fp);
for (size_t i = 0; i < n; i++) {
char c = inbuff[i];
if (c == '\r' || c == '\n') {
y++;
x = start_x;
continue;
}
if (c != ' ' && y < height && x < width) {
Glyph g = orca_is_valid_glyph(c) ? (Glyph)c : '.';
gbuffer_poke(gbuffer, height, width, y, x, g);
if (x > max_x)
max_x = x;
if (y > max_y)
max_y = y;
}
x++;
}
if (n < sizeof inbuff)
break;
}
int status = pclose(fp);
*out_h = max_y - start_y + 1;
*out_w = max_x - start_x + 1;
return status ? Cboard_error_process_exit_error : Cboard_error_none;
}
ORCA_NOINLINE
Conf_read_result conf_read_line(FILE *file, char *buf, Usz bufsize,
char **out_left, Usz *out_leftsize,
char **out_right, Usz *out_rightsize) {
// a0 and a1 are the start and end positions of the left side of an "foo=bar"
// pair. b0 and b1 are the positions right side. Leading and trailing spaces
// will be removed.
Usz len, a0, a1, b0, b1;
char *s;
if (bufsize < 2)
goto insufficient_buffer;
#if SIZE_MAX > INT_MAX
if (bufsize > (Usz)INT_MAX)
exit(1); // he boot too big
#endif
s = fgets(buf, (int)bufsize, file);
if (!s) {
if (feof(file))
goto eof;
goto ioerror;
}
len = strlen(buf);
if (len == bufsize - 1 && buf[len - 1] != '\n' && !feof(file))
goto insufficient_buffer;
a0 = 0;
for (;;) { // scan for first non-space in " foo=bar"
if (a0 == len)
goto ignore;
char c = s[a0];
if (c == ';' || c == '#') // comment line, ignore
goto ignore;
if (c == '=') // '=' before any other char, bad
goto ignore;
if (!isspace(c))
break;
a0++;
}
a1 = a0;
for (;;) { // scan for '='
a1++;
if (a1 == len)
goto ignore;
char c = s[a1];
Usz x = a1; // don't include any whitespace preceeding the '='
while (isspace(c)) {
x++;
if (x == len)
goto ignore;
c = s[x];
}
if (c == '=') {
b0 = x;
break;
}
a1 = x;
}
for (;;) { // scan for first non-whitespace after '='
b0++;
if (b0 == len) { // empty right side, but still valid pair
b1 = b0;
goto ok;
}
char c = s[b0];
if (!isspace(c))
break;
}
b1 = b0;
for (;;) { // scan for end of useful stuff for right-side value
b1++;
if (b1 == len)
goto ok;
char c = s[b1];
Usz x = b1; // don't include any whitespace preceeding the EOL
while (isspace(c)) {
x++;
if (x == len)
goto ok;
c = s[x];
}
b1 = x;
}
Conf_read_result err;
insufficient_buffer:
err = Conf_read_buffer_too_small;
goto fail;
eof:
err = Conf_read_eof;
goto fail;
ioerror:
err = Conf_read_io_error;
goto fail;
fail:
*out_left = NULL;
*out_leftsize = 0;
goto null_right;
ignore:
s[len - 1] = '\0';
*out_left = s;
*out_leftsize = len;
err = Conf_read_irrelevant;
goto null_right;
null_right:
*out_right = NULL;
*out_rightsize = 0;
return err;
ok:
s[a1] = '\0';
s[b1] = '\0';
*out_left = s + a0;
*out_leftsize = a1 - a0;
*out_right = s + b0;
*out_rightsize = b1 - b0;
return Conf_read_left_and_right;
}
bool conf_read_match(FILE **pfile, char const *const *names, Usz nameslen,
char *buf, Usz bufsize, Usz *out_index, char **out_value) {
FILE *file = *pfile;
if (!file)
return false;
char *left;
Usz leftsz, rightsz;
next_line:;
Conf_read_result res =
conf_read_line(file, buf, bufsize, &left, &leftsz, out_value, &rightsz);
switch (res) {
case Conf_read_left_and_right:
for (Usz i = 0; i < nameslen; i++) {
if (strcmp(names[i], left) == 0) {
*out_index = i;
return true;
}
}
goto next_line;
case Conf_read_irrelevant:
goto next_line;
case Conf_read_buffer_too_small:
case Conf_read_eof:
case Conf_read_io_error:
break;
}
fclose(file);
*pfile = NULL;
return false;
}
typedef enum {
Conf_dir_ok = 0,
Conf_dir_no_home,
} Conf_dir_error;
static Conf_dir_error try_get_conf_dir(oso **out) {
char const *xdgcfgdir = getenv(xdg_config_home_env);
if (xdgcfgdir) {
Usz xdgcfgdirlen = strlen(xdgcfgdir);
if (xdgcfgdirlen > 0) {
osoputlen(out, xdgcfgdir, xdgcfgdirlen);
return Conf_dir_ok;
}
}
char const *homedir = getenv(home_env);
if (homedir) {
Usz homedirlen = strlen(homedir);
if (homedirlen > 0) {
osoputprintf(out, "%s/.config", homedir);
return Conf_dir_ok;
}
}
return Conf_dir_no_home;
}
static void conf_impl_catconfpath(oso **p, char const *conf_file_name,
size_t conflen) {
oso *path = *p;
size_t n = osolen(path);
osoensurecap(&path, n + 1 + conflen);
if (!path)
goto done;
((char *)path)[n] = '/';
memcpy((char *)path + n + 1, conf_file_name, conflen);
((char *)path)[n + 1 + conflen] = '\0';
osopokelen(path, n + 1 + conflen);
done:
*p = path;
}
FILE *conf_file_open_for_reading(char const *conf_file_name) {
if (!conf_file_name)
return NULL;
oso *path = NULL;
if (try_get_conf_dir(&path))
return NULL;
size_t conflen = strlen(conf_file_name);
if (conflen == 0)
return NULL;
conf_impl_catconfpath(&path, conf_file_name, conflen);
if (!path)
return NULL;
FILE *file = fopen(osoc(path), "r");
osofree(path);
return file;
}
Conf_save_start_error conf_save_start(Conf_save *p,
char const *conf_file_name) {
*p = (Conf_save){0};
oso *dir = NULL;
Conf_save_start_error err;
if (!conf_file_name) {
err = Conf_save_start_bad_conf_name;
goto cleanup;
}
if (try_get_conf_dir(&dir)) {
err = Conf_save_start_no_home;
goto cleanup;
}
if (!dir)
goto allocfail;
osoputoso(&p->canonpath, dir);
if (!p->canonpath)
goto allocfail;
size_t namelen = strlen(conf_file_name);
if (namelen == 0) {
err = Conf_save_start_bad_conf_name;
goto cleanup;
}
conf_impl_catconfpath(&p->canonpath, conf_file_name, namelen);
if (!p->canonpath)
goto allocfail;
osoputoso(&p->temppath, p->canonpath);
if (!p->temppath)
goto allocfail;
osocat(&p->temppath, ".tmp");
if (!p->temppath)
goto allocfail;
// Remove old temp file if it exists. If it exists and we can't remove it,
// error.
if (unlink(osoc(p->temppath)) == -1 && errno != ENOENT) {
switch (errno) {
case ENOTDIR:
err = Conf_save_start_conf_dir_not_dir;
break;
case EACCES:
err = Conf_save_start_temp_file_perm_denied;
break;
default:
err = Conf_save_start_old_temp_file_stuck;
break;
}
goto cleanup;
}
p->tempfile = fopen(osoc(p->temppath), "w");
if (!p->tempfile) {
// Try to create config dir, in case it doesn't exist. (XDG says we should
// do this, and use mode 0700.)
mkdir(osoc(dir), 0700);
p->tempfile = fopen(osoc(p->temppath), "w");
}
if (!p->tempfile) {
err = Conf_save_start_temp_file_open_failed;
goto cleanup;
}
// This may be left as NULL.
p->origfile = fopen(osoc(p->canonpath), "r");
// We did it, boys.
osofree(dir);
return Conf_save_start_ok;
allocfail:
err = Conf_save_start_alloc_failed;
cleanup:
osofree(dir);
conf_save_cancel(p);
return err;
}
void conf_save_cancel(Conf_save *p) {
osofree(p->canonpath);
osofree(p->temppath);
if (p->origfile)
fclose(p->origfile);
if (p->tempfile)
fclose(p->tempfile);
*p = (Conf_save){0};
}
Conf_save_commit_error conf_save_commit(Conf_save *p) {
Conf_save_commit_error err;
fclose(p->tempfile);
p->tempfile = NULL;
if (p->origfile) {
fclose(p->origfile);
p->origfile = NULL;
}
// This isn't really atomic. But if we want to close and move a file
// simultaneously, I think we have to use OS-specific facilities. So I guess
// this is the best we can do for now. I could be wrong, though. But I
// couldn't find any good information about it.
if (rename(osoc(p->temppath), osoc(p->canonpath)) == -1) {
err = Conf_save_commit_rename_failed;
goto cleanup;
}
err = Conf_save_commit_ok;
cleanup:
conf_save_cancel(p);
return err;
}
char const *ezconf_w_errorstring(Ezconf_w_error error) {
switch (error) {
case Ezconf_w_ok:
return "No error";
case Ezconf_w_bad_conf_name:
return "Bad config file name";
case Ezconf_w_oom:
return "Out of memory";
case Ezconf_w_no_home:
return "Unable to resolve $XDG_CONFIG_HOME or $HOME";
case Ezconf_w_mkdir_failed:
return "Unable to create $XDG_CONFIG_HOME or $HOME/.config directory";
case Ezconf_w_conf_dir_not_dir:
return "Config directory path is not a directory";
case Ezconf_w_old_temp_file_stuck:
return "Unable to remove old .conf.tmp file";
case Ezconf_w_temp_file_perm_denied:
return "Permission denied for config directory";
case Ezconf_w_temp_open_failed:
return "Unable to open .conf.tmp for writing";
case Ezconf_w_temp_fsync_failed:
return "fsync() reported an when writing temp file.\n"
"Refusing to continue.";
case Ezconf_w_temp_close_failed:
return "Unable to close temp file";
case Ezconf_w_rename_failed:
return "Unable to rename .conf.tmp to .conf";
case Ezconf_w_line_too_long:
return "Line in file is too long";
case Ezconf_w_existing_read_error:
return "Error when reading existing configuration file";
case Ezconf_w_unknown_error:
break;
}
return "Unknown";
}
void ezconf_r_start(Ezconf_r *ezcr, char const *conf_file_name) {
ezcr->file = conf_file_open_for_reading(conf_file_name);
ezcr->index = 0;
ezcr->value = NULL;
}
bool ezconf_r_step(Ezconf_r *ezcr, char const *const *names, size_t nameslen) {
return conf_read_match(&ezcr->file, names, nameslen, ezcr->buffer,
sizeof ezcr->buffer, &ezcr->index, &ezcr->value);
}
enum {
Confwflag_add_newline = 1 << 0,
Ezconf_opt_written = 1 << 0,
};
void ezconf_w_start(Ezconf_w *ezcw, Ezconf_opt *optsbuffer, size_t buffercap,
char const *conf_file_name) {
*ezcw = (Ezconf_w){.save = {0}}; // Weird to silence clang warning
ezcw->opts = optsbuffer;
ezcw->optscap = buffercap;
Ezconf_w_error error = Ezconf_w_unknown_error;
switch (conf_save_start(&ezcw->save, conf_file_name)) {
case Conf_save_start_ok:
error = Ezconf_w_ok;
ezcw->file = ezcw->save.tempfile;
break;
case Conf_save_start_bad_conf_name:
error = Ezconf_w_bad_conf_name;
break;
case Conf_save_start_alloc_failed:
error = Ezconf_w_oom;
break;
case Conf_save_start_no_home:
error = Ezconf_w_no_home;
break;
case Conf_save_start_mkdir_failed:
error = Ezconf_w_mkdir_failed;
break;
case Conf_save_start_conf_dir_not_dir:
error = Ezconf_w_conf_dir_not_dir;
break;
case Conf_save_start_old_temp_file_stuck:
error = Ezconf_w_old_temp_file_stuck;
break;
case Conf_save_start_temp_file_perm_denied:
error = Ezconf_w_temp_file_perm_denied;
break;
case Conf_save_start_temp_file_open_failed:
error = Ezconf_w_temp_open_failed;
break;
}
ezcw->error = error;
}
void ezconf_w_addopt(Ezconf_w *ezcw, char const *key, intptr_t id) {
size_t count = ezcw->optscount, cap = ezcw->optscap;
if (count == cap)
return;
ezcw->opts[count] = (Ezconf_opt){.name = key, .id = id, .flags = 0};
ezcw->optscount = count + 1;
}
bool ezconf_w_step(Ezconf_w *ezcw) {
uint32_t stateflags = ezcw->stateflags;
FILE *origfile = ezcw->save.origfile, *tempfile = ezcw->save.tempfile;
Ezconf_opt *opts = ezcw->opts, *chosen = NULL;
size_t optscount = ezcw->optscount;
if (ezcw->error || !tempfile) // Already errored or finished ok
return false;
// If we set a flag to write a closing newline the last time we were called,
// write it now.
if (stateflags & Confwflag_add_newline) {
fputs("\n", tempfile);
stateflags &= ~(uint32_t)Confwflag_add_newline;
}
if (!optscount)
goto commit;
if (!origfile)
goto write_leftovers;
for (;;) { // Scan through file looking for known keys in key=value lines
char linebuff[1024];
char *left, *right;
size_t leftsz, rightsz;
Conf_read_result res = conf_read_line(origfile, linebuff, sizeof linebuff,
&left, &leftsz, &right, &rightsz);
switch (res) {
case Conf_read_left_and_right: {
for (size_t i = 0; i < optscount; i++) {
char const *name = opts[i].name;
if (!name)
continue;
if (strcmp(name, left) != 0)
continue;
// If we already wrote this one, comment out the line instead, and move
// on to the next line.
if (opts[i].flags & (uint8_t)Ezconf_opt_written) {
fputs("# ", tempfile);
goto write_landr;
}
chosen = opts + i;
goto return_for_writing;
}
write_landr:
fputs(left, tempfile);
fputs(" = ", tempfile);
fputs(right, tempfile);
fputs("\n", tempfile);
continue;
}
case Conf_read_irrelevant:
fputs(left, tempfile);
fputs("\n", tempfile);
continue;
case Conf_read_eof:
goto end_original;
case Conf_read_buffer_too_small:
ezcw->error = Ezconf_w_line_too_long;
goto cancel;
case Conf_read_io_error:
ezcw->error = Ezconf_w_existing_read_error;
goto cancel;
}
}
end_original: // Don't need original file anymore
fclose(origfile);
ezcw->save.origfile = origfile = NULL;
write_leftovers: // Write out any guys that weren't in original file.
for (;;) { // Find the first guy that wasn't already written.
if (!optscount)
goto commit;
chosen = opts;
// Drop the guy from the front of the list. This is to reduce super-linear
// complexity growth as the number of conf key-value pairs are increased.
// (Otherwise, we iterate the full set of guys on each call during the
// "write the leftovers" phase.)
opts++;
optscount--;
if (!(chosen->flags & (uint8_t)Ezconf_opt_written))
break;
}
// Once control has reached here, we're going to return true to the caller.
// Which means we expect to be called at least one more time. So update the
// pointers stored in the persistent state, so that we don't have to scan
// through as much of this list next time. (This might even end up finishing
// it off, making it empty.)
ezcw->opts = opts;
ezcw->optscount = optscount;
return_for_writing:
chosen->flags |= (uint8_t)Ezconf_opt_written;
fputs(chosen->name, tempfile);
fputs(" = ", tempfile);
ezcw->optid = chosen->id;
stateflags |= (uint32_t)Confwflag_add_newline;
ezcw->stateflags = stateflags;
return true;
cancel:
conf_save_cancel(&ezcw->save);
// ^- Sets tempfile to null, which we use as a guard at the top of this
// function.
ezcw->file = NULL;
ezcw->stateflags = 0;
return false;
commit:;
Ezconf_w_error error = Ezconf_w_unknown_error;
switch (conf_save_commit(&ezcw->save)) {
case Conf_save_commit_ok:
error = Ezconf_w_ok;
break;
case Conf_save_commit_temp_fsync_failed:
error = Ezconf_w_temp_fsync_failed;
break;
case Conf_save_commit_temp_close_failed:
error = Ezconf_w_temp_close_failed;
break;
case Conf_save_commit_rename_failed:
error = Ezconf_w_rename_failed;
break;
}
ezcw->file = NULL;
ezcw->error = error;
ezcw->stateflags = 0;
return false;
}