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term.c - iomenu - interactive terminal-based selection menu |
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git clone git://bitreich.org/iomenu git://enlrupgkhuxnvlhsf6lc3fziv5h2hhfrinws65d7roiv6bfj7d652fid.onion/iomenu (git://bitreich.org) |
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--- |
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term.c (1806B) |
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--- |
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1 #include "term.h" |
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2 #include <ctype.h> |
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3 #include <stdint.h> |
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4 #include <stdio.h> |
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5 #include <string.h> |
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6 #include <sys/ioctl.h> |
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7 #include <termios.h> |
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8 #include "compat.h" |
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9 #include "utf8.h" |
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10 |
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11 struct term term; |
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12 |
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13 static int |
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14 term_codepoint_width(uint32_t codepoint, int pos) |
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15 { |
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16 if (codepoint == '\t') |
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17 return 8 - pos % 8; |
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18 return wcwidth(codepoint); |
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19 } |
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20 |
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21 int |
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22 term_at_width(char const *s, int width, int pos) |
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23 { |
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24 char const *beg = s; |
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25 |
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26 for (uint32_t state = 0, codepoint; *s != '\0'; s++) { |
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27 if (utf8_decode(&state, &codepoint, *s) == UTF8_ACCEPT) { |
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28 pos += term_codepoint_width(codepoint, pos); |
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29 if (pos > width) |
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30 break; |
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31 } |
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32 } |
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33 return s - beg; |
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34 } |
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35 |
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36 int |
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37 term_raw_on(int fd) |
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38 { |
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39 static char *seq = "\x1b[s\x1b[?1049h\x1b[H"; |
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40 struct termios termios; |
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41 ssize_t len = strlen(seq); |
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42 |
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43 if (write(fd, seq, len) < len) |
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44 return -1; |
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45 |
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46 memset(&termios, 0, sizeof termios); |
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47 if (tcgetattr(fd, &term.termios) < 0) |
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48 return -1; |
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49 memcpy(&termios, &term.termios, sizeof termios); |
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50 |
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51 termios.c_lflag &= ~(ICANON | ECHO | IEXTEN | IGNBRK | ISIG); |
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52 if (tcsetattr(fd, TCSANOW, &termios) == -1) |
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53 return -1; |
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54 return 0; |
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55 } |
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56 |
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57 int |
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58 term_raw_off(int fd) |
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59 { |
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60 static char *seq = "\x1b[2J\x1b[u\033[?1049l"; |
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61 ssize_t len = strlen(seq); |
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62 |
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63 if (tcsetattr(fd, TCSANOW, &term.termios) < 0) |
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64 return -1; |
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65 if (write(fd, seq, len) < len) |
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66 return -1; |
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67 return 0; |
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68 } |
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69 |
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70 int |
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71 term_get_key(FILE *fp) |
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72 { |
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73 int key, num; |
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74 |
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75 key = fgetc(fp); |
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76 top: |
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77 switch (key) { |
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78 case EOF: |
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79 return -1; |
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80 case TERM_KEY_ALT('['): |
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81 key = getc(fp); |
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82 if (key == EOF) |
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83 return -1; |
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84 |
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85 for (num = 0; isdigit(key);) { |
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86 num *= 10; |
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87 num += key - '0'; |
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88 |
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89 key = fgetc(fp); |
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90 if (key == EOF) |
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91 return -1; |
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92 } |
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93 |
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94 key = TERM_KEY_CSI(key, num); |
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95 |
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96 goto top; |
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97 case TERM_KEY_ESC: |
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98 key = getc(fp); |
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99 if (key == EOF) |
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100 return -1; |
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101 key = TERM_KEY_ALT(key); |
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102 goto top; |
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103 default: |
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104 return key; |
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105 } |
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106 } |
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