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tterm.c - iomenu - interactive terminal-based selection menu |
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git clone git://bitreich.org/iomenu git://hg6vgqziawt5s4dj.onion/iomenu (git://bitreich.org) |
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--- |
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tterm.c (1800B) |
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--- |
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1 #include "term.h" |
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2 |
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3 #include <ctype.h> |
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4 #include <stdint.h> |
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5 #include <stdio.h> |
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6 #include <string.h> |
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7 #include <sys/ioctl.h> |
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8 #include <termios.h> |
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9 |
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10 #include "compat.h" |
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11 #include "utf8.h" |
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12 |
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13 struct term term = {0}; |
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14 |
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15 static int |
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16 term_codepoint_width(uint32_t codepoint, int pos) |
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17 { |
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18 if (codepoint == '\t') |
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19 return 8 - pos % 8; |
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20 return wcwidth(codepoint); |
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21 } |
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22 |
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23 int |
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24 term_at_width(char const *s, int width, int pos) |
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25 { |
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26 char const *beg = s; |
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27 |
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28 for (uint32_t state = 0, codepoint; *s != '\0'; s++) { |
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29 if (utf8_decode(&state, &codepoint, *s) == UTF8_ACCEPT) { |
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30 pos += term_codepoint_width(codepoint, pos); |
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31 if (pos > width) |
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32 break; |
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33 } |
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34 } |
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35 return s - beg; |
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36 } |
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37 |
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38 int |
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39 term_raw_on(int fd) |
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40 { |
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41 struct termios new_termios = {0}; |
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42 char *seq = "\x1b[s\x1b[?1049h\x1b[H"; |
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43 ssize_t len = strlen(seq); |
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44 |
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45 if (write(fd, seq, len) < len) |
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46 return -1; |
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47 |
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48 if (tcgetattr(fd, &term.old_termios) < 0) |
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49 return -1; |
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50 memcpy(&new_termios, &term.old_termios, sizeof new_termios); |
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51 |
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52 new_termios.c_lflag &= ~(ICANON | ECHO | IEXTEN | IGNBRK | ISIG); |
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53 if (tcsetattr(fd, TCSANOW, &new_termios) == -1) |
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54 return -1; |
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55 return 0; |
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56 } |
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57 |
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58 int |
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59 term_raw_off(int fd) |
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60 { |
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61 char *seq = "\x1b[2J\x1b[u\033[?1049l"; |
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62 ssize_t len = strlen(seq); |
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63 |
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64 if (tcsetattr(fd, TCSANOW, &term.old_termios) < 0) |
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65 return -1; |
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66 if (write(fd, seq, len) < len) |
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67 return -1; |
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68 return 0; |
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69 } |
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70 |
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71 int |
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72 term_get_key(FILE *fp) |
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73 { |
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74 int key, num; |
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75 |
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76 key = fgetc(fp); |
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77 top: |
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78 switch (key) { |
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79 case EOF: |
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80 return -1; |
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81 case TERM_KEY_ALT('['): |
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82 key = getc(fp); |
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83 if (key == EOF) |
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84 return -1; |
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85 |
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86 for (num = 0; isdigit(key);) { |
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87 num *= 10; |
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88 num += key - '0'; |
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89 |
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90 key = fgetc(fp); |
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91 if (key == EOF) |
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92 return -1; |
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93 } |
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94 |
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95 key = TERM_KEY_CSI(key, num); |
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96 |
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97 goto top; |
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98 case TERM_KEY_ESC: |
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99 key = getc(fp); |
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100 if (key == EOF) |
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101 return -1; |
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102 key = TERM_KEY_ALT(key); |
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103 goto top; |
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104 default: |
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105 return key; |
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106 } |
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107 } |
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