diff options
Diffstat (limited to 'src/utils.c')
| -rw-r--r-- | src/utils.c | 290 |
1 files changed, 107 insertions, 183 deletions
diff --git a/src/utils.c b/src/utils.c index b165111..949b1b7 100644 --- a/src/utils.c +++ b/src/utils.c @@ -42,6 +42,8 @@ #include <ctype.h> #include <sys/types.h> #include <errno.h> +#include <fcntl.h> +#include <sys/wait.h> #include "calcurse.h" @@ -230,189 +232,6 @@ print_in_middle (WINDOW *win, int starty, int startx, int width, char *string) custom_remove_attr (win, ATTR_HIGHEST); } -/* Print the string at the desired position. */ -static void -showstring (WINDOW *win, int x, int y, char *str, int len, int scroff, - int curpos) -{ - char c = 0; - - /* print string */ - mvwaddnstr (win, y, x, &str[scroff], -1); - wclrtoeol (win); - - /* print scrolling indicator */ - if (scroff > 0 && scroff < len - col) - c = '*'; - else if (scroff > 0) - c = '<'; - else if (scroff < len - col) - c = '>'; - mvwprintw (win, y, col - 1, "%c", c); - - /* print cursor */ - wmove (win, y, curpos - scroff); - - if (curpos >= len) - waddch (win, SPACE | A_REVERSE); - else - waddch (win, str[curpos] | A_REVERSE); -} - -/* Delete a character at the given position in string. */ -static void -del_char (int pos, char *str) -{ - str += pos; - memmove (str, str + 1, strlen (str) + 1); -} - -/* Add a character at the given position in string. */ -static void -ins_char (int pos, int ch, char *str) -{ - str += pos; - memmove (str + 1, str, strlen (str) + 1); - *str = ch; -} - -static void -bell (void) -{ - printf ("\a"); -} - -/* - * Getstring allows to get user input and to print it on a window, - * even if noecho() is on. This function is also used to modify an existing - * text (the variable string can be non-NULL). - * We need to do the echoing manually because of the multi-threading - * environment, otherwise the cursor would move from place to place without - * control. - */ -enum getstr -getstring (WINDOW *win, char *str, int l, int x, int y) -{ - const int pgsize = col / 3; - - int len = strlen (str); - int curpos = len; - int scroff = 0; - int ch; - - custom_apply_attr (win, ATTR_HIGHEST); - - for (;;) { - while (curpos < scroff) - scroff -= pgsize; - while (curpos >= scroff + col - 1) - scroff += pgsize; - - showstring (win, x, y, str, len, scroff, curpos); - wins_doupdate (); - - if ((ch = wgetch (win)) == '\n') break; - switch (ch) - { - case KEY_BACKSPACE: /* delete one character */ - case 330: - case 127: - case CTRL ('H'): - if (curpos > 0) - { - del_char ((--curpos), str); - len--; - } - else - bell (); - break; - case CTRL ('D'): /* delete next character */ - if (curpos < len) - { - del_char (curpos, str); - len--; - } - else - bell (); - break; - case CTRL ('W'): /* delete a word */ - if (curpos > 0) { - while (curpos && str[curpos - 1] == ' ') - { - del_char ((--curpos), str); - len--; - } - while (curpos && str[curpos - 1] != ' ') - { - del_char ((--curpos), str); - len--; - } - } - else - bell (); - break; - case CTRL ('K'): /* delete to end-of-line */ - str[curpos] = 0; - len = curpos; - break; - case CTRL ('A'): /* go to begginning of string */ - curpos = 0; - break; - case CTRL ('E'): /* go to end of string */ - curpos = len; - break; - case KEY_LEFT: /* move one char backward */ - case CTRL ('B'): - if (curpos > 0) curpos--; - break; - case KEY_RIGHT: /* move one char forward */ - case CTRL ('F'): - if (curpos < len) curpos++; - break; - case ESCAPE: /* cancel editing */ - return (GETSTRING_ESC); - break; - default: /* insert one character */ - if (len < l - 1) - { - ins_char ((curpos++), ch, str); - len++; - } - } - } - - custom_remove_attr (win, ATTR_HIGHEST); - - return (len == 0 ? GETSTRING_RET : GETSTRING_VALID); -} - -/* Update an already existing string. */ -int -updatestring (WINDOW *win, char **str, int x, int y) -{ - int len = strlen (*str); - char *buf; - enum getstr ret; - - EXIT_IF (len + 1 > BUFSIZ, _("Internal error: line too long")); - - buf = mem_malloc (BUFSIZ); - (void)memcpy (buf, *str, len + 1); - - ret = getstring (win, buf, BUFSIZ, x, y); - - if (ret == GETSTRING_VALID) - { - len = strlen (buf); - *str = mem_realloc (*str, len + 1, 1); - EXIT_IF (*str == NULL, _("out of memory")); - (void)memcpy (*str, buf, len + 1); - } - - mem_free (buf); - return ret; -} - /* checks if a string is only made of digits */ int is_all_digit (char *string) @@ -916,3 +735,108 @@ psleep (unsigned secs) for (unslept = sleep (secs); unslept; unslept = sleep (unslept)) ; } + +/* + * Fork and execute an external process. + * + * If pfdin and/or pfdout point to a valid address, a pipe is created and the + * appropriate file descriptors are written to pfdin/pfdout. + */ +int +fork_exec (int *pfdin, int *pfdout, const char *path, char *const *arg) +{ + int pin[2], pout[2]; + int pid; + + if (pfdin && (pipe (pin) == -1)) + return 0; + if (pfdout && (pipe (pout) == -1)) + return 0; + + if ((pid = fork ()) == 0) + { + if (pfdout) + { + if (dup2 (pout[0], STDIN_FILENO) < 0) + _exit (127); + close (pout[0]); + close (pout[1]); + } + + if (pfdin) + { + if (dup2 (pin[1], STDOUT_FILENO) < 0) + _exit (127); + close (pin[0]); + close (pin[1]); + } + + execvp (path, arg); + _exit (127); + } + else + { + if (pfdin) + close (pin[1]); + if (pfdout) + close (pout[0]); + + if (pid > 0) + { + if (pfdin) + { + fcntl (pin[0], F_SETFD, FD_CLOEXEC); + *pfdin = pin[0]; + } + if (pfdout) + { + fcntl (pout[1], F_SETFD, FD_CLOEXEC); + *pfdout = pout[1]; + } + } + else + { + if (pfdin) + close (pin[0]); + if (pfdout) + close (pout[1]); + return 0; + } + } + return pid; +} + +/* Execute an external program in a shell. */ +int +shell_exec (int *pfdin, int *pfdout, char *cmd) +{ + char *arg[] = { "/bin/sh", "-c", cmd, NULL }; + return fork_exec (pfdin, pfdout, *arg, arg); +} + +/* Wait for a child process to terminate. */ +int +child_wait (int *pfdin, int *pfdout, int pid) +{ + int stat; + + if (pfdin) + close (*pfdin); + if (pfdout) + close (*pfdout); + + waitpid (pid, &stat, 0); + return stat; +} + +/* Display "Press any key to continue..." and wait for a key press. */ +void +press_any_key (void) +{ + fflush (stdout); + fputs (_("Press any key to continue..."), stdout); + fflush (stdout); + fgetc (stdin); + fflush (stdin); + fputs ("\r\n", stdout); +} |