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OpenAudio_ArduinoLibrary/examples/FT8Receive/textR.ino

207 lines
4.6 KiB

// #include "text.h"
#include <string.h>
//extern bool true;
//extern bool false;
const char * trim_front(const char *str) {
// Skip leading whitespace
while (*str == ' ') {
str++;
}
return str;
}
void trim_back(char *str) {
// Skip trailing whitespace by replacing it with '\0' characters
int idx = strlen(str) - 1;
while (idx >= 0 && str[idx] == ' ') {
str[idx--] = '\0';
}
}
// 1) trims a string from the back by changing whitespaces to '\0'
// 2) trims a string from the front by skipping whitespaces
char * trim(char *str) {
str = (char *)trim_front(str);
trim_back(str);
// return a pointer to the first non-whitespace character
return str;
}
char to_upper(char c) {
return (c >= 'a' && c <= 'z') ? (c - 'a' + 'A') : c;
}
bool is_digit(char c) {
return (c >= '0') && (c <= '9');
}
bool is_letter(char c) {
return ((c >= 'A') && (c <= 'Z')) || ((c >= 'a') && (c <= 'z'));
}
bool is_space(char c) {
return (c == ' ');
}
bool in_range(char c, char min, char max) {
return (c >= min) && (c <= max);
}
bool starts_with(const char *string, const char *prefix) {
return 0 == memcmp(string, prefix, strlen(prefix));
}
bool equals(const char *string1, const char *string2) {
return 0 == strcmp(string1, string2);
}
int char_index(const char *string, char c) {
for (int i = 0; *string; ++i, ++string) {
if (c == *string) {
return i;
}
}
return -1; // Not found
}
// Text message formatting:
// - replaces lowercase letters with uppercase
// - merges consecutive spaces into single space
void fmtmsg(char *msg_out, const char *msg_in) {
char c;
char last_out = 0;
while ( (c = *msg_in) ) {
if (c != ' ' || last_out != ' ') {
last_out = to_upper(c);
*msg_out = last_out;
++msg_out;
}
++msg_in;
}
*msg_out = 0; // Add zero termination
}
// Parse a 2 digit integer from string
int dd_to_int(const char *str, int length) {
int result = 0;
bool negative;
int i;
if (str[0] == '-') {
negative = true;
i = 1; // Consume the - sign
}
else {
negative = false;
i = (str[0] == '+') ? 1 : 0; // Consume a + sign if found
}
while (i < length) {
if (str[i] == 0) break;
if (!is_digit(str[i])) break;
result *= 10;
result += (str[i] - '0');
++i;
}
return negative ? -result : result;
}
// Convert a 2 digit integer to string
void int_to_dd(char *str, int value, int width, bool full_sign) {
if (value < 0) {
*str = '-';
++str;
value = -value;
}
else if (full_sign) {
*str = '+';
++str;
}
int divisor = 1;
for (int i = 0; i < width - 1; ++i) {
divisor *= 10;
}
while (divisor >= 1) {
int digit = value / divisor;
*str = '0' + digit;
++str;
value -= digit * divisor;
divisor /= 10;
}
*str = 0; // Add zero terminator
}
// convert integer index to ASCII character according to one of 6 tables:
// table 0: " 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ+-./?"
// table 1: " 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ"
// table 2: "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ"
// table 3: "0123456789"
// table 4: " ABCDEFGHIJKLMNOPQRSTUVWXYZ"
// table 5: " 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ/"
char charn(int c, int table_idx) {
if (table_idx != 2 && table_idx != 3) {
if (c == 0) return ' ';
c -= 1;
}
if (table_idx != 4) {
if (c < 10) return '0' + c;
c -= 10;
}
if (table_idx != 3) {
if (c < 26) return 'A' + c;
c -= 26;
}
if (table_idx == 0) {
if (c < 5) return "+-./?" [c];
}
else if (table_idx == 5) {
if (c == 0) return '/';
}
return '_'; // unknown character, should never get here
}
// Convert character to its index (charn in reverse) according to a table
int nchar(char c, int table_idx) {
int n = 0;
if (table_idx != 2 && table_idx != 3) {
if (c == ' ') return n + 0;
n += 1;
}
if (table_idx != 4) {
if (c >= '0' && c <= '9') return n + (c - '0');
n += 10;
}
if (table_idx != 3) {
if (c >= 'A' && c <= 'Z') return n + (c - 'A');
n += 26;
}
if (table_idx == 0) {
if (c == '+') return n + 0;
if (c == '-') return n + 1;
if (c == '.') return n + 2;
if (c == '/') return n + 3;
if (c == '?') return n + 4;
}
else if (table_idx == 5) {
if (c == '/') return n + 0;
}
// Character not found
return -1;
}