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cvargcal
Joined: 17 Feb 2015
Posts: 134
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| Empty field with strok |
 Posted: Mon Oct 23, 2017 10:03 pm |
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I am trying to tokenize a string but I need to know exactly when no data is seen between two tokens. e.g when tokenizing the following string "a,b,c,,,d,e" I need to know about the two empty slots between 'd' and 'e'... which I am unable to find out simply using strtok().
I want write "0" if is empty
| Code: | char str[150];
char gprmc[] = "$GPRMC,";
char tokens[] = ",";
int i;
char *p, *lat=0, *latDir=0, *lon=0, *lonDir=0, *time=0,*validity=0,*speed=0,*course=0,*date=0,*variation=0,*east=0,*checksum;
fgets(str, STREAM_GPS); ///fprintf(STREAM_USB,"%s\r\n",str);
if (find_string(str,gprmc)){ //if (strstr(str, gprmc) != 0){
fprintf(STREAM_USB, "%s", str);
p = strtok(str, tokens);
i = 0;
while(p != NULL){
switch(i++){
// !$GPRMC,045103.000,A,3014.1984,N,09749.2872,W,0.67,161.46,030913,,,A*7C
case 1: time = p; break; // 1 220516 Time Stamp
case 2: validity=p; break; // 2 A validity - A-ok, V-invalid
case 3: lat = p; break; // 3 5133.82 current Latitude
case 4: latDir = p; break; // 4 N North/South
case 5: lon = p; break; // 5 00042.24 current Longitude
case 6: lonDir = p; break; // 6 W East/West
case 7: speed = p; break; // 7 173.8 Speed in knots
case 8: course = p; break; // 8 231.8 True course
case 9: date = p; break; // 9 130694 Date Stamp
case 10: variation = p; break; // 10 004.2 Variation
case 11: east = p; break; // 11 W East/West
case 12: checksum = p; break; // 12 *70 checksum
default: break;
}
p = strtok(NULL, tokens);
} |
for example: $GPRMC,040146.000,A,,,,W,,,241017,,,A*44
How I can put "0" if the data is empty?
I want similar to
https://stackoverflow.com/questions/8705844/need-to-know-when-no-data-appears-between-two-token-separators-using-strtok |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Tue Oct 24, 2017 12:47 am |
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It tells you the answer in those threads:
Use strsep() instead of strtok(). See the link below for strsep() source:
https://code.woboq.org/userspace/glibc/string/strsep.c.html
When translating that code, remember that 'const' in normal C is
different from 'const' in CCS. |
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cvargcal
Joined: 17 Feb 2015
Posts: 134
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| Posted: Tue Oct 24, 2017 8:08 am |
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Hi, Thanks so much for you answer,
I tried translating but not work
Original
| Code: | char *strtok_single (char * str, char const * delims)
{
static char * src = NULL;
char * p, * ret = 0;
if (str != NULL)
src = str;
if (src == NULL)
return NULL;
if ((p = strpbrk (src, delims)) != NULL) {
*p = 0;
ret = src;
src = ++p;
} else if (*src) {
ret = src;
src = NULL;
}
return ret;
} |
example
| Code: | char delims[] = ",";
char data [] = "foo,bar,,baz,biz";
char * p = strtok_single (data, delims);
while (p) {
printf ("%s\n", *p ? p : "<empty>");
p = strtok_single (NULL, delims);
} |
output
foo
bar
<empty>
baz
biz
To CCS
| Code: | void main(void){
while(true){
char delims[] = ",";
char data[] = "foo,bar,,baz,biz";
char *p;
p= strtok_single (data, delims);
while (p) {
fprintf(STREAM_USB, "%s\n", *p ? p : "<empty>");
p = strtok_single (NULL, delims);
}
}
}
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| Code: | char *strtok_single (char *str, char *delims){
static char *src = NULL;
char *p, *ret = 0;
if (str != NULL) src = str;
if (src == NULL) return NULL;
p = strpbrk (src, delims)
if (p != NULL) {
*p = 0;
ret = src;
src = ++p;
}
else {
if(*src){
ret = src;
src = NULL;
}
}
return ret;
} |
No work as show the example... work as do it normally
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Ttelmah
Joined: 11 Mar 2010
Posts: 19595
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| Posted: Tue Oct 24, 2017 1:40 pm |
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Have you got PASS_STRINGS=IN_RAM
This is needed or the "<EMPTY>" won't code as a pointer.
I'd explicitly test for the NULL, rather than relying on this coding as FALSE
(*p!=NULL)?p:"<ENTER>" |
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cvargcal
Joined: 17 Feb 2015
Posts: 134
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| Posted: Tue Oct 24, 2017 3:44 pm |
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| Ttelmah wrote: | Have you got PASS_STRINGS=IN_RAM
This is needed or the "<EMPTY>" won't code as a pointer.
I'd explicitly test for the NULL, rather than relying on this coding as FALSE
(*p!=NULL)?p:"<ENTER>" |
mmm I dont undertand if i see NULL value in debug by proteus... and that line has not effect
| Code: | | fprintf(STREAM_USB, "%s\n", (p!=NULL)?p:"<ENTER>"); |
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guy
Joined: 21 Oct 2005
Posts: 297
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| Posted: Wed Oct 25, 2017 7:12 am |
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| See the sticky at the top of the forum. Proteus simulator is not welcome here since it is not a good simulator. Can you set up a real PIC and debugger? |
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temtronic
Joined: 01 Jul 2010
Posts: 9273
Location: Greensville,Ontario
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| Posted: Wed Oct 25, 2017 7:25 am |
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yeah Proteus is so full of it's own bugs, I'm NOT surprised it doesn't work as expected...
I supose the FIRST question we have to ask when replying to every (well most) posts is...
Is this REAL hardware or a 'simulation' ? |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Wed Oct 25, 2017 9:02 am |
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| Quote: | | No work as show the example... work as do it normally |
Post the results that you get from the translated code.
You said the good code produces this:
| Quote: | foo
bar
<empty>
baz
biz |
Post what the bad code produces. |
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cvargcal
Joined: 17 Feb 2015
Posts: 134
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| Posted: Wed Oct 25, 2017 4:29 pm |
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| PCM programmer wrote: | | Quote: | | No work as show the example... work as do it normally |
Post the results that you get from the translated code.
You said the good code produces this:
| Quote: | foo
bar
<empty>
baz
biz |
Post what the bad code produces. |
Yes, proteus not too good...
the result is:
bar
baz
biz
No put <empty> , so the code do it the same as do it my code....
mmmm
I read the function strsep() is better, so how i can use this:
| Code: | char *strsep (char **stringp, char *delim){
char *begin, *end;
begin = *stringp;
if (begin == NULL)
return NULL;
/* Find the end of the token. */
end = begin + strcspn (begin, delim);
if (*end) {
/* Terminate the token and set *STRINGP past NUL character. */
*end++ = '\0';
*stringp = end;
}
else{
/* No more delimiters; this is the last token. */
*stringp = NULL;
}
return begin;
} |
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cvargcal
Joined: 17 Feb 2015
Posts: 134
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| Posted: Wed Mar 27, 2019 10:13 am |
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Hi, I return to this topic again.
I need control a string with empty space, I need put 0x00 when has not data.
string ="a,b,0,d";
output
a
b
0
d |
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Gabriel
Joined: 03 Aug 2009
Posts: 1067
Location: Panama
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| Posted: Wed Mar 27, 2019 12:15 pm |
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| Quote: | I need control a string with empty space, I need put 0x00 when has not data.
string ="a,b,0,d"; |
The hex value for "0" is 0x30 if i remember my ASCII Table correctly... its not 0x00.
try:
| Code: | | string ="a,b,\0,d"; |
BUT be advised, any string operations on this modified string will treat the "\0" as the end of the string (strings are null terminated).
_________________
CCS PCM 5.078 & CCS PCH 5.093 |
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cvargcal
Joined: 17 Feb 2015
Posts: 134
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| Posted: Wed Mar 27, 2019 12:28 pm |
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| Thanks, but the idea is parsing the string for separate by token with strtok(), but put any char if found empty space. |
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cvargcal
Joined: 17 Feb 2015
Posts: 134
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| Posted: Thu Mar 28, 2019 10:41 am |
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Hi, I found this code,
someone suggestion for change to char and not for float?
https://stackoverflow.com/questions/9210528/split-string-with-delimiters-in-c
| Code: | #include <stdio.h>
#include <string.h>
#include <stdlib.h>
int split(float *res , char *string , char delim);
int split(float *res , char *string , char delim){
int strLen = 0;
int commaCount =0; // count the number of commas
int commaCountOld =0; // count the number of commas
int wordEndChar = 0;
int wordStartChar = -1;
int wordLength =0;
for(strLen=0; string[strLen] != '\0'; strLen++){ // first get the string length
if ( (string[strLen] == delim) || ( string[strLen+1] == '\0' )) {
commaCount++;
wordEndChar = strLen;
}
if ( (commaCount - commaCountOld) > 0 ) {
int aIter =0;
wordLength = (wordEndChar - wordStartChar);
char word[55] = "";
for (aIter = 0; aIter < wordLength; aIter++) {
word[aIter] = string[strLen-wordLength+aIter+1];
}
if (word[aIter-1] == delim) word[aIter-1] = '\0';
// printf("\n");
word[wordLength] = '\0';
res[commaCount-1] = atof(&word[0]);
wordLength = 0;
wordStartChar = wordEndChar;
commaCountOld = commaCount;
}
}
return commaCount;
}
void main(){
char string[] = "1,,3"; // specify input here
float array_r[10]; // specify size of float array here
int totalValues = 0;
char myDelim = ','; // specify delimiter here
printf("string => %s \n",&string[0]);
totalValues = split(&array_r[0] , &string[0], myDelim); // call the function here
int tokens = 0;
for (tokens = 0 ; tokens < totalValues ; tokens++) {
printf("array_r[%d] = %0.f\n",tokens , array_r[tokens]);
}
}
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output
string => 1,,3
array_r[0] = 1
array_r[1] = 0
array_r[2] = 3 |
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