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annotate ringtools/imy/firstpass.c @ 893:85091e14be9c

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fc-buzplay: PWT refactoring, first step
author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 03 Apr 2022 08:00:50 +0000
parents 0d6814238109
children
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882
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1 /*
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2 * This module implements the first pass of fc-imy2pwt processing:
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3 * reading and parsing the iMelody input file at the level of lines,
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4 * storing the melody for subsequent processing and catching the
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5 * optional BEAT: line, if present.
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6 */
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7
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8 #include <ctype.h>
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9 #include <stdio.h>
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10 #include <stdlib.h>
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11 #include <string.h>
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12 #include <strings.h>
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13 #include "sizelimits.h"
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14
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15 extern char *imy_filename;
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16 extern char melody_str_buf[MELODY_BUF_SIZE];
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17 extern unsigned beats_per_min;
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18
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19 static char *melody_write_ptr, *melody_write_endp;
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20 static int lineno;
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21
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22 static void
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23 copy_melody_str(line)
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24 char *line;
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25 {
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26 char *cp, *np;
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27
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28 cp = line;
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29 while (isspace(*cp))
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30 cp++;
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31 if (!*cp) {
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32 fprintf(stderr, "%s line %d: empty melody line\n",
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33 imy_filename, lineno);
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34 exit(1);
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35 }
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36 for (np = cp; *cp && !isspace(*cp); cp++)
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37 ;
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38 if (*cp)
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39 *cp++ = '\0';
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40 while (isspace(*cp))
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41 cp++;
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42 if (*cp) {
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43 fprintf(stderr, "%s line %d: single melody string expected\n",
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44 imy_filename, lineno);
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45 exit(1);
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46 }
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47 if (strlen(np) > (melody_write_endp - melody_write_ptr)) {
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48 fprintf(stderr, "%s line %d: melody buffer size exceeded\n",
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49 imy_filename, lineno);
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50 exit(1);
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51 }
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52 strcpy(melody_write_ptr, np);
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53 melody_write_ptr += strlen(np);
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54 }
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55
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56 static void
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57 process_beat_line(line)
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58 char *line;
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59 {
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60 if (!isdigit(*line)) {
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61 fprintf(stderr, "%s line %d: number expected on BEAT: line\n",
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62 imy_filename, lineno);
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63 exit(1);
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64 }
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65 beats_per_min = atoi(line);
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66 if (beats_per_min < 25 || beats_per_min > 900) {
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67 fprintf(stderr, "%s line %d: bpm number is out of range\n",
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68 imy_filename, lineno);
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69 exit(1);
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70 }
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71 }
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72
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73 read_imy_firstpass()
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74 {
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75 FILE *inf;
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76 char linebuf[LINE_BUF_SIZE];
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77 int prev_line_is_melody;
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78
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79 inf = fopen(imy_filename, "r");
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80 if (!inf) {
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81 perror(imy_filename);
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82 exit(1);
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83 }
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84 melody_write_ptr = melody_str_buf;
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85 melody_write_endp = melody_str_buf + MELODY_BUF_SIZE - 1;
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86 for (lineno = 1; fgets(linebuf, sizeof linebuf, inf); lineno++) {
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87 if (!index(linebuf, '\n')) {
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88 fprintf(stderr,
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89 "%s line %d: too long or unterminated\n",
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90 imy_filename, lineno);
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91 exit(1);
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92 }
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93 if (linebuf[0] == ' ' || linebuf[0] == '\t') {
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94 if (lineno == 1) {
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95 fprintf(stderr,
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96 "%s line 1: invalid continuation\n",
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97 imy_filename);
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98 exit(1);
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99 }
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100 if (prev_line_is_melody)
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101 copy_melody_str(linebuf);
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102 continue;
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103 }
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104 if (!strncasecmp(linebuf, "MELODY:", 7)) {
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105 copy_melody_str(linebuf + 7);
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106 prev_line_is_melody = 1;
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107 } else if (!strncasecmp(linebuf, "BEAT:", 5)) {
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108 process_beat_line(linebuf + 5);
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109 prev_line_is_melody = 0;
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110 } else if (!strncasecmp(linebuf, "END:IMELODY", 11))
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111 break;
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112 else
882
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113 prev_line_is_melody = 0;
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114 }
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115 fclose(inf);
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116 if (!melody_str_buf[0]) {
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117 fprintf(stderr, "error: no melody found in %s\n", imy_filename);
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118 exit(1);
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119 }
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120 }