URGENT School program - morse code convert to/from alpha/digital

Row · Feb 21, 2000

We have been assigned to do a project from Deitel/Deitel's "C How to Program" 2nd Edition pg 361, #8.39. I have been working this for about 8 hours and just cannot get it to work. I have put my answer below and hope someone can look at it and see what is wrong. I just cann't get it. Feel free to email me at <A HREF="mailto:Rowlandl@aol.com">Rowlandl@aol.com</A>, hope to hear from someone soon 
 
#include <stdio.h> 
#include <string.h> 
#include <ctype.h> 
 
/* Put spaces at end of morse code string to simplify processing. */ 
char *MorseAlphabet[26] = { 
".- ", /* A */ 
"-... ", /* B */ 
"-.-. ", /* C */ 
"-.. ", /* D */ 
". ", /* E */ 
"..-. ", /* F */ 
"--. " , /* G */ 
".... ", /* H */ 
".. " , /* I */ 
".--- ", /* J */ 
"-.- ", /* K */ 
".-.. ", /* L */ 
"-- ", /* M */ 
"-. ", /* N */ 
"--- ", /* O */ 
".--.", /* P */ 
"--.- ", /* Q */ 
".-. ", /* R */ 
"... ", /* S */ 
"- ", /* T */ 
"..- ", /* U */ 
"...- ", /* V */ 
".-- ", /* W */ 
"-..- ", /* X */ 
"-.--", /* Y */ 
"--.. ", /* Z */ 
}; 
 
char *MorseDigits[10] = { 
"----- ", /* 0 */ 
".---- ", /* 1 */ 
"..--- ", /* 2 */ 
"...--" , /* 3 */ 
"....- ", /* 4 */ 
"..... ", /* 5 */ 
"-.... ", /* 6 */ 
"--... ", /* 7 */ 
"---.. ", /* 8 */ 
"----. ", /* 9 */ 
}; 
 
int ConvertToAlpha(char *in, char *out, int size); 
 
int main() 
{ 
char myTest[] = "..... .... . .-.. .-.. --- ... "; 
char result[1024]; 
int blError; 
 
printf("Converting %s\n", myTest); 
blError = ConvertToAlpha(myTest, result, sizeof(result)); 
if(!blError) 
printf("retrieved: %s\n", result); 
else 
printf("error, got partial result: %s\n", result); 
 
return 0; 
} 
 
/* 
* FUNCTION: ConvertToAlpha 
* PURPOSE: accepts a buffer of morse code and converts it into alphanumeric. 
* Returns 1 if successful, 0 if if it fails. 
*/ 
int ConvertToAlpha(); 
char *in; /* Pointer to input buffer (contains alpha, digit, spaces) */ 
char *out; /* Pointer to output buffer (will contain morse code) */ 
int size; /* Size of the output buffer */ 
 
 
char *pszCurrIn; 
char *pszCurrOut; 
int i; 
int iIndex; 
int blDone = 1; 
int iLength; 
int blFound; 
int blError = 1; 
 
 
/* Initialize the current out and in pointers*/ 
pszCurrIn = in; 
pszCurrOut = out; 
 
/* Intialize buffer count to 0*/ 
i = 0; 
 
/* We do the loop until we have either filled the buffer or we've finished. */ 
/* Note, a space is reserved for the terminator...*/ 
while(i < (size - 1) ¦¦ !blDone) 
{ 
/* Is it the beginning of a morse code token?*/ 
if('\0' != *pszCurrIn && !isspace(*pszCurrIn)) 
{ 
/* Yup. Init the found flag to zero*/ 
blFound = 0; 
 
/* Is this an alphabetical morse code token?*/ 
for(iIndex = 0; iIndex < 26 && !blFound; iIndex++) 
{ 
if(!strncmp(*pszCurrIn, MorseAlphabet[iIndex], strlen(MorseAlphabet[iIndex]))) 
{ 
/* Apparently so - copy the correct character into the output.*/ 
sprintf(pszCurrOut, "%c", iIndex + 'A'); 
 
/* Get the length of the morse code token*/ 
iLength = strlen(MorseAlphabet[iIndex]); 
 
/* Increase pszCurrIn by the length of the token (go past it)*/ 
pszCurrIn += iLength; 
 
/* Increase outbuffer used count*/ 
i++; 
 
/* Signify we found the token match.*/ 
blFound = 0; 
 
/* Go to the next location on the buffer output.*/ 
pszCurrOut++; 
} 
} 
 
/* Did we not find the correct buffer token in alphabet land?*/ 
if(!blFound) 
{ 
/* Nope. Check to see if it is a digit.*/ 
for(iIndex = 0; iIndex < 10 && !blFound; iIndex++) 
{ 
if(!strncmp(pszCurrIn, MorseDigits[iIndex], strlen(MorseDigits[iIndex]))) 
{ 
/* Found it. copy the correct character into the output*/ 
sprintf(pszCurrOut, "%c", iIndex + '0'); 
 
/* Get the length of the morse code token*/ 
iLength = strlen(MorseDigits[iIndex]); 
 
/* Increase pszCurrIn by the length of the token (go past it)*/ 
pszCurrIn += iLength; 
 
/* Increase outbuffer used count.*/ 
i++; 
 
/* Signify we found a token match.*/ 
blFound = 1; 
 
/* Go to the next location on the buffer output.*/ 
pszCurrOut++; 
} 
} 
} 
 
/* Did we still not find it?*/ 
if(!blFound) 
{ 
/* Yup, this must be an error - abort.*/ 
blDone = 1; 
blError = 1; 
 
/* Terminate the string.*/ 
*pszCurrOut = ' '; 
} 
 
} 
 
/*Is it a space?*/ 
else if(isspace(*pszCurrIn)); 
{ 
/* Well if it is, there must be one more and then a non-space after it..*/ 
if(isspace(*(pszCurrIn + 1)) && !isspace(*(pszCurrIn + 2))) 
{ 
/* Ok, it's a space (3 spaces in morse code representation.*/ 
sprintf(pszCurrOut, " &quot

; 
 
/* Increase outbuffer used count.*/ 
i++; 
 
/* Jump ahead in the input buffer pas the spaces.*/ 
pszCurrIn += 2; 
 
/* Go to the next lcoation in the buffer output.*/ 
pszCurrOut++; 
} 
else 
{ 
/* Well, next one isn't a space, or the one after that is, so this is*/ 
/* a problem. Abort.*/ 
blDone = 1; 
blError = 1; 
 
/* Terminate the string.*/ 
*pszCurrOut = '\0'; 
 
} 
} 
 
/* Is it end of string? */ 
if('\0' == *pszCurrIn) 
{ 
blDone = 1; 
*pszCurrOut = '\0'; 
} 
 
/* Well, if we get down to here, it must be a problem.*/ 
else 
{ 
blDone = 1; 
blError = 0; 
 
pszCurrOut = '\0'; 
} 
 
 
/* Did we get a done flag?*/ 
if blDone 
{ 
/* Nope, we ran out of buffer space. Terminate and signify an error.*/ 
*pszCurrOut = '\0'; 
blError = 1; 
} 
else 
 
/* Yup, terminate the output buffer.*/ 
*pszCurrOut = '\0'; 
 
 
/* Return 1 if successful, 0 if error.*/ 
return !blError; 
 
}

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URGENT School program - morse code convert to/from alpha/digital

Row

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