strTok function (thread safe, supports empty tokens, doesn't change string)
.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty{ margin-bottom:0;
}
4
$begingroup$
I'm new to C language and want to explode a string like we do in PHP explode() function, I searched for a built-in function with the C standard library, and I found strtok , but It doesn't support empty tokens like 1,2,3,,5 . Inspired by the answers I found in this SO question I made this function, it is supposed to be thread safe and support empty tokens and doesn't change the original string
char* strTok(char** newString, char* delimiter)
{
char* string = *newString;
char* delimiterFound = (char*) 0;
int tokLenght = 0;
char* tok = (char*) 0;
if(!string) return (char*) 0;
delimiterFound = strstr(string, delimiter);
if(delimiterFound){
tokLenght = delimiterFound-string;
}else{
tokLenght = strlen(string);
}
tok = malloc(tokLenght + 1);
memcpy(tok, string, tokLenght);
tok[tokLenght] = '';
*newString = delimiterFound ? delimiterFound + strlen(delimiter) : (char*)0;
return tok;
}
I designed it to be used like
char* input = "1,2,3,4,5,6,7,,,10,";
char** inputP = &input;
char* tok;
while( (tok=strTok(inputP, ",")) ){
printf("%sn", tok);
}
beginner c strings
asked Apr 6 at 0:03
Accountant مAccountant م
22418
$endgroup$
add a comment |
4
$begingroup$
I'm new to C language and want to explode a string like we do in PHP explode() function, I searched for a built-in function with the C standard library, and I found strtok , but It doesn't support empty tokens like 1,2,3,,5 . Inspired by the answers I found in this SO question I made this function, it is supposed to be thread safe and support empty tokens and doesn't change the original string
char* strTok(char** newString, char* delimiter)
{
char* string = *newString;
char* delimiterFound = (char*) 0;
int tokLenght = 0;
char* tok = (char*) 0;
if(!string) return (char*) 0;
delimiterFound = strstr(string, delimiter);
if(delimiterFound){
tokLenght = delimiterFound-string;
}else{
tokLenght = strlen(string);
}
tok = malloc(tokLenght + 1);
memcpy(tok, string, tokLenght);
tok[tokLenght] = '';
*newString = delimiterFound ? delimiterFound + strlen(delimiter) : (char*)0;
return tok;
}
I designed it to be used like
char* input = "1,2,3,4,5,6,7,,,10,";
char** inputP = &input;
char* tok;
while( (tok=strTok(inputP, ",")) ){
printf("%sn", tok);
}
beginner c strings
asked Apr 6 at 0:03
Accountant مAccountant م
22418
$endgroup$
1
$begingroup$
Better user-interface then the originalstrtok. You may be interested instrsep, too. code.woboq.org/userspace/glibc/string/strsep.c.html
$endgroup$
– Neil Edelman
Apr 6 at 1:59
$begingroup$
@NeilEdelman thanks I never saw this function before, I will check it.
$endgroup$
– Accountant م
Apr 6 at 2:09
1
$begingroup$
It's not in the standardClibraries, but inPOSIX, (any type ofgcc.) However, likestrtok, it obliterates thecharto replace it with, so it's not the same.
$endgroup$
– Neil Edelman
Apr 6 at 2:17
add a comment |
4
4
4
$begingroup$
I'm new to C language and want to explode a string like we do in PHP explode() function, I searched for a built-in function with the C standard library, and I found strtok , but It doesn't support empty tokens like 1,2,3,,5 . Inspired by the answers I found in this SO question I made this function, it is supposed to be thread safe and support empty tokens and doesn't change the original string
char* strTok(char** newString, char* delimiter)
{
char* string = *newString;
char* delimiterFound = (char*) 0;
int tokLenght = 0;
char* tok = (char*) 0;
if(!string) return (char*) 0;
delimiterFound = strstr(string, delimiter);
if(delimiterFound){
tokLenght = delimiterFound-string;
}else{
tokLenght = strlen(string);
}
tok = malloc(tokLenght + 1);
memcpy(tok, string, tokLenght);
tok[tokLenght] = '';
*newString = delimiterFound ? delimiterFound + strlen(delimiter) : (char*)0;
return tok;
}
I designed it to be used like
char* input = "1,2,3,4,5,6,7,,,10,";
char** inputP = &input;
char* tok;
while( (tok=strTok(inputP, ",")) ){
printf("%sn", tok);
}
beginner c strings
asked Apr 6 at 0:03
Accountant مAccountant م
22418
$endgroup$
I'm new to C language and want to explode a string like we do in PHP explode() function, I searched for a built-in function with the C standard library, and I found strtok , but It doesn't support empty tokens like 1,2,3,,5 . Inspired by the answers I found in this SO question I made this function, it is supposed to be thread safe and support empty tokens and doesn't change the original string
char* strTok(char** newString, char* delimiter)
{
char* string = *newString;
char* delimiterFound = (char*) 0;
int tokLenght = 0;
char* tok = (char*) 0;
if(!string) return (char*) 0;
delimiterFound = strstr(string, delimiter);
if(delimiterFound){
tokLenght = delimiterFound-string;
}else{
tokLenght = strlen(string);
}
tok = malloc(tokLenght + 1);
memcpy(tok, string, tokLenght);
tok[tokLenght] = '';
*newString = delimiterFound ? delimiterFound + strlen(delimiter) : (char*)0;
return tok;
}
I designed it to be used like
char* input = "1,2,3,4,5,6,7,,,10,";
char** inputP = &input;
char* tok;
while( (tok=strTok(inputP, ",")) ){
printf("%sn", tok);
}
beginner c strings
beginner c strings
asked Apr 6 at 0:03
Accountant مAccountant م
22418
asked Apr 6 at 0:03
Accountant مAccountant م
22418
asked Apr 6 at 0:03
Accountant مAccountant م
22418
asked Apr 6 at 0:03
Accountant مAccountant م
22418
asked Apr 6 at 0:03
Accountant مAccountant م
22418
22418
1
$begingroup$
Better user-interface then the originalstrtok. You may be interested instrsep, too. code.woboq.org/userspace/glibc/string/strsep.c.html
$endgroup$
– Neil Edelman
Apr 6 at 1:59
$begingroup$
@NeilEdelman thanks I never saw this function before, I will check it.
$endgroup$
– Accountant م
Apr 6 at 2:09
1
$begingroup$
It's not in the standardClibraries, but inPOSIX, (any type ofgcc.) However, likestrtok, it obliterates thecharto replace it with, so it's not the same.
$endgroup$
– Neil Edelman
Apr 6 at 2:17
add a comment |
1
$begingroup$
Better user-interface then the originalstrtok. You may be interested instrsep, too. code.woboq.org/userspace/glibc/string/strsep.c.html
$endgroup$
– Neil Edelman
Apr 6 at 1:59
$begingroup$
@NeilEdelman thanks I never saw this function before, I will check it.
$endgroup$
– Accountant م
Apr 6 at 2:09
1
$begingroup$
It's not in the standardClibraries, but inPOSIX, (any type ofgcc.) However, likestrtok, it obliterates thecharto replace it with, so it's not the same.
$endgroup$
– Neil Edelman
Apr 6 at 2:17
1
1
$begingroup$
Better user-interface then the original
strtok. You may be interested in strsep, too. code.woboq.org/userspace/glibc/string/strsep.c.html$endgroup$
– Neil Edelman
Apr 6 at 1:59
$begingroup$
Better user-interface then the original
strtok. You may be interested in strsep, too. code.woboq.org/userspace/glibc/string/strsep.c.html$endgroup$
– Neil Edelman
Apr 6 at 1:59
$begingroup$
@NeilEdelman thanks I never saw this function before, I will check it.
$endgroup$
– Accountant م
Apr 6 at 2:09
$begingroup$
@NeilEdelman thanks I never saw this function before, I will check it.
$endgroup$
– Accountant م
Apr 6 at 2:09
1
1
$begingroup$
It's not in the standard
C libraries, but in POSIX, (any type of gcc.) However, like strtok, it obliterates the char to replace it with $endgroup$
– Neil Edelman
Apr 6 at 2:17
$begingroup$
It's not in the standard
C libraries, but in POSIX, (any type of gcc.) However, like strtok, it obliterates the char to replace it with $endgroup$
– Neil Edelman
Apr 6 at 2:17
add a comment |
2 Answers
2
active
oldest
votes
3
$begingroup$
delimiterFound + strlen(delimiter)sounds like a bug. If the delimiter is longer than one character,*newStringwill point too far into the original, maybe even beyond the end. Correct me if I am wrong,delimiterFound + 1is what you are actually after.
Modern C allows, and strongly encourages, to declare variables as close to their use a possible. Consider
char * delimiterFound = strstr(string, delimiter);
....
char * tok = malloc(tokLenght + 1);
etc.
Always test that
mallocdidn't fail.
More spaces - around keywords, braces, etc - definitely improve readability:
if (....) {
....
} else {
....
}
answered Apr 6 at 1:24
vnpvnp
40.7k233103
$endgroup$
1
$begingroup$
Thaaank you very much for these precious points, regarding the delimiter length bug, ummmm, I want to support long delimiters more than 1 characters like the boundary string in http requests that has content-type multi-part, and I don't think it's a bug becausedelimiterFound + strlen(delimiter)can never be after the 0 byte that terminates the original string!, right ?"fooDELIMITER" 3 + 12
$endgroup$
– Accountant م
Apr 6 at 1:41
$begingroup$
@Accountantم Long delimiters here refer to, say",;.", in where any character delimits the string on its own right.
$endgroup$
– vnp
Apr 6 at 1:52
$begingroup$
I didn't get it, I'm sorry, can you please give me an example input that can break this code, exploiting this bug ?
$endgroup$
– Accountant م
Apr 6 at 2:03
1
$begingroup$
@Accountantم Sorry for not being clear. I should realize that your intentions are different (and readman strstrmore carefully). Consider it my blinder - since you mentionedstrtok, I expected thestrtoksemantics.
$endgroup$
– vnp
Apr 6 at 2:09
$begingroup$
It's my fault because I said it'sstrtok, I wantedstrtokthat can support delimiters more than 1 characters, because I need this feature a lot. So do you mean it's not a bug ??
$endgroup$
– Accountant م
Apr 6 at 2:14
|
show 1 more comment
2
$begingroup$
From a readability viewpoint, you should use NULL instead of (char*) 0 as it is easier to recognize what you're trying to do. Also, the tokLenght misspells "length", and should probably be tokLength.
You leak memory, as the memory allocated to hold the returned string is never freed.
answered Apr 6 at 0:57
1201ProgramAlarm1201ProgramAlarm
3,7232925
$endgroup$
$begingroup$
Thank you very much I will use NULL from now on, and I will remember tofree()memory , 'I miss PHP garbage collector :(', I didn't get thetokLengthspelling note, aren't they the same ?
$endgroup$
– Accountant م
Apr 6 at 1:42
1
$begingroup$
It's a matter of style, and including.hif you want to useNULL. However, you don't have to cast(char *)0, just use0(orNULL.) It knows from the return type.
$endgroup$
– Neil Edelman
Apr 6 at 2:03
1
$begingroup$
@Accountantم For the spelling, you used G-H-T when the correct spelling is G-T-H (the last two letters are swapped). I've made that typo before. I find having identifiers spelled correctly helps with reading and finding them, although the autocomplete in IDEs mitigates that a little but propagates the misspellings.
$endgroup$
– 1201ProgramAlarm
2 days ago
$begingroup$
@1201ProgramAlarm ooh, 😮 how come I didn't notice this after revising it multiple times!, thanks.
$endgroup$
– Accountant م
2 days ago
add a comment |
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2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
3
$begingroup$
delimiterFound + strlen(delimiter)sounds like a bug. If the delimiter is longer than one character,*newStringwill point too far into the original, maybe even beyond the end. Correct me if I am wrong,delimiterFound + 1is what you are actually after.
Modern C allows, and strongly encourages, to declare variables as close to their use a possible. Consider
char * delimiterFound = strstr(string, delimiter);
....
char * tok = malloc(tokLenght + 1);
etc.
Always test that
mallocdidn't fail.
More spaces - around keywords, braces, etc - definitely improve readability:
if (....) {
....
} else {
....
}
answered Apr 6 at 1:24
vnpvnp
40.7k233103
$endgroup$
1
$begingroup$
Thaaank you very much for these precious points, regarding the delimiter length bug, ummmm, I want to support long delimiters more than 1 characters like the boundary string in http requests that has content-type multi-part, and I don't think it's a bug becausedelimiterFound + strlen(delimiter)can never be after the 0 byte that terminates the original string!, right ?"fooDELIMITER" 3 + 12
$endgroup$
– Accountant م
Apr 6 at 1:41
$begingroup$
@Accountantم Long delimiters here refer to, say",;.", in where any character delimits the string on its own right.
$endgroup$
– vnp
Apr 6 at 1:52
$begingroup$
I didn't get it, I'm sorry, can you please give me an example input that can break this code, exploiting this bug ?
$endgroup$
– Accountant م
Apr 6 at 2:03
1
$begingroup$
@Accountantم Sorry for not being clear. I should realize that your intentions are different (and readman strstrmore carefully). Consider it my blinder - since you mentionedstrtok, I expected thestrtoksemantics.
$endgroup$
– vnp
Apr 6 at 2:09
$begingroup$
It's my fault because I said it'sstrtok, I wantedstrtokthat can support delimiters more than 1 characters, because I need this feature a lot. So do you mean it's not a bug ??
$endgroup$
– Accountant م
Apr 6 at 2:14
|
show 1 more comment
3
$begingroup$
delimiterFound + strlen(delimiter)sounds like a bug. If the delimiter is longer than one character,*newStringwill point too far into the original, maybe even beyond the end. Correct me if I am wrong,delimiterFound + 1is what you are actually after.
Modern C allows, and strongly encourages, to declare variables as close to their use a possible. Consider
char * delimiterFound = strstr(string, delimiter);
....
char * tok = malloc(tokLenght + 1);
etc.
Always test that
mallocdidn't fail.
More spaces - around keywords, braces, etc - definitely improve readability:
if (....) {
....
} else {
....
}
answered Apr 6 at 1:24
vnpvnp
40.7k233103
$endgroup$
1
$begingroup$
Thaaank you very much for these precious points, regarding the delimiter length bug, ummmm, I want to support long delimiters more than 1 characters like the boundary string in http requests that has content-type multi-part, and I don't think it's a bug becausedelimiterFound + strlen(delimiter)can never be after the 0 byte that terminates the original string!, right ?"fooDELIMITER" 3 + 12
$endgroup$
– Accountant م
Apr 6 at 1:41
$begingroup$
@Accountantم Long delimiters here refer to, say",;.", in where any character delimits the string on its own right.
$endgroup$
– vnp
Apr 6 at 1:52
$begingroup$
I didn't get it, I'm sorry, can you please give me an example input that can break this code, exploiting this bug ?
$endgroup$
– Accountant م
Apr 6 at 2:03
1
$begingroup$
@Accountantم Sorry for not being clear. I should realize that your intentions are different (and readman strstrmore carefully). Consider it my blinder - since you mentionedstrtok, I expected thestrtoksemantics.
$endgroup$
– vnp
Apr 6 at 2:09
$begingroup$
It's my fault because I said it'sstrtok, I wantedstrtokthat can support delimiters more than 1 characters, because I need this feature a lot. So do you mean it's not a bug ??
$endgroup$
– Accountant م
Apr 6 at 2:14
|
show 1 more comment
3
3
3
$begingroup$
delimiterFound + strlen(delimiter)sounds like a bug. If the delimiter is longer than one character,*newStringwill point too far into the original, maybe even beyond the end. Correct me if I am wrong,delimiterFound + 1is what you are actually after.
Modern C allows, and strongly encourages, to declare variables as close to their use a possible. Consider
char * delimiterFound = strstr(string, delimiter);
....
char * tok = malloc(tokLenght + 1);
etc.
Always test that
mallocdidn't fail.
More spaces - around keywords, braces, etc - definitely improve readability:
if (....) {
....
} else {
....
}
answered Apr 6 at 1:24
vnpvnp
40.7k233103
$endgroup$
delimiterFound + strlen(delimiter)sounds like a bug. If the delimiter is longer than one character,*newStringwill point too far into the original, maybe even beyond the end. Correct me if I am wrong,delimiterFound + 1is what you are actually after.
Modern C allows, and strongly encourages, to declare variables as close to their use a possible. Consider
char * delimiterFound = strstr(string, delimiter);
....
char * tok = malloc(tokLenght + 1);
etc.
Always test that
mallocdidn't fail.
More spaces - around keywords, braces, etc - definitely improve readability:
if (....) {
....
} else {
....
}
answered Apr 6 at 1:24
vnpvnp
40.7k233103
answered Apr 6 at 1:24
vnpvnp
40.7k233103
answered Apr 6 at 1:24
vnpvnp
40.7k233103
answered Apr 6 at 1:24
vnpvnp
40.7k233103
40.7k233103
1
$begingroup$
Thaaank you very much for these precious points, regarding the delimiter length bug, ummmm, I want to support long delimiters more than 1 characters like the boundary string in http requests that has content-type multi-part, and I don't think it's a bug becausedelimiterFound + strlen(delimiter)can never be after the 0 byte that terminates the original string!, right ?"fooDELIMITER" 3 + 12
$endgroup$
– Accountant م
Apr 6 at 1:41
$begingroup$
@Accountantم Long delimiters here refer to, say",;.", in where any character delimits the string on its own right.
$endgroup$
– vnp
Apr 6 at 1:52
$begingroup$
I didn't get it, I'm sorry, can you please give me an example input that can break this code, exploiting this bug ?
$endgroup$
– Accountant م
Apr 6 at 2:03
1
$begingroup$
@Accountantم Sorry for not being clear. I should realize that your intentions are different (and readman strstrmore carefully). Consider it my blinder - since you mentionedstrtok, I expected thestrtoksemantics.
$endgroup$
– vnp
Apr 6 at 2:09
$begingroup$
It's my fault because I said it'sstrtok, I wantedstrtokthat can support delimiters more than 1 characters, because I need this feature a lot. So do you mean it's not a bug ??
$endgroup$
– Accountant م
Apr 6 at 2:14
|
show 1 more comment
1
$begingroup$
Thaaank you very much for these precious points, regarding the delimiter length bug, ummmm, I want to support long delimiters more than 1 characters like the boundary string in http requests that has content-type multi-part, and I don't think it's a bug becausedelimiterFound + strlen(delimiter)can never be after the 0 byte that terminates the original string!, right ?"fooDELIMITER" 3 + 12
$endgroup$
– Accountant م
Apr 6 at 1:41
$begingroup$
@Accountantم Long delimiters here refer to, say",;.", in where any character delimits the string on its own right.
$endgroup$
– vnp
Apr 6 at 1:52
$begingroup$
I didn't get it, I'm sorry, can you please give me an example input that can break this code, exploiting this bug ?
$endgroup$
– Accountant م
Apr 6 at 2:03
1
$begingroup$
@Accountantم Sorry for not being clear. I should realize that your intentions are different (and readman strstrmore carefully). Consider it my blinder - since you mentionedstrtok, I expected thestrtoksemantics.
$endgroup$
– vnp
Apr 6 at 2:09
$begingroup$
It's my fault because I said it'sstrtok, I wantedstrtokthat can support delimiters more than 1 characters, because I need this feature a lot. So do you mean it's not a bug ??
$endgroup$
– Accountant م
Apr 6 at 2:14
1
1
$begingroup$
Thaaank you very much for these precious points, regarding the delimiter length bug, ummmm, I want to support long delimiters more than 1 characters like the boundary string in http requests that has content-type multi-part, and I don't think it's a bug because
delimiterFound + strlen(delimiter) can never be after the 0 byte that terminates the original string!, right ? "fooDELIMITER" 3 + 12$endgroup$
– Accountant م
Apr 6 at 1:41
$begingroup$
Thaaank you very much for these precious points, regarding the delimiter length bug, ummmm, I want to support long delimiters more than 1 characters like the boundary string in http requests that has content-type multi-part, and I don't think it's a bug because
delimiterFound + strlen(delimiter) can never be after the 0 byte that terminates the original string!, right ? "fooDELIMITER" 3 + 12$endgroup$
– Accountant م
Apr 6 at 1:41
$begingroup$
@Accountantم Long delimiters here refer to, say
",;.", in where any character delimits the string on its own right.$endgroup$
– vnp
Apr 6 at 1:52
$begingroup$
@Accountantم Long delimiters here refer to, say
",;.", in where any character delimits the string on its own right.$endgroup$
– vnp
Apr 6 at 1:52
$begingroup$
I didn't get it, I'm sorry, can you please give me an example input that can break this code, exploiting this bug ?
$endgroup$
– Accountant م
Apr 6 at 2:03
$begingroup$
I didn't get it, I'm sorry, can you please give me an example input that can break this code, exploiting this bug ?
$endgroup$
– Accountant م
Apr 6 at 2:03
1
1
$begingroup$
@Accountantم Sorry for not being clear. I should realize that your intentions are different (and read
man strstr more carefully). Consider it my blinder - since you mentioned strtok, I expected the strtok semantics.$endgroup$
– vnp
Apr 6 at 2:09
$begingroup$
@Accountantم Sorry for not being clear. I should realize that your intentions are different (and read
man strstr more carefully). Consider it my blinder - since you mentioned strtok, I expected the strtok semantics.$endgroup$
– vnp
Apr 6 at 2:09
$begingroup$
It's my fault because I said it's
strtok, I wanted strtok that can support delimiters more than 1 characters, because I need this feature a lot. So do you mean it's not a bug ??$endgroup$
– Accountant م
Apr 6 at 2:14
$begingroup$
It's my fault because I said it's
strtok, I wanted strtok that can support delimiters more than 1 characters, because I need this feature a lot. So do you mean it's not a bug ??$endgroup$
– Accountant م
Apr 6 at 2:14
|
show 1 more comment
2
$begingroup$
From a readability viewpoint, you should use NULL instead of (char*) 0 as it is easier to recognize what you're trying to do. Also, the tokLenght misspells "length", and should probably be tokLength.
You leak memory, as the memory allocated to hold the returned string is never freed.
answered Apr 6 at 0:57
1201ProgramAlarm1201ProgramAlarm
3,7232925
$endgroup$
$begingroup$
Thank you very much I will use NULL from now on, and I will remember tofree()memory , 'I miss PHP garbage collector :(', I didn't get thetokLengthspelling note, aren't they the same ?
$endgroup$
– Accountant م
Apr 6 at 1:42
1
$begingroup$
It's a matter of style, and including.hif you want to useNULL. However, you don't have to cast(char *)0, just use0(orNULL.) It knows from the return type.
$endgroup$
– Neil Edelman
Apr 6 at 2:03
1
$begingroup$
@Accountantم For the spelling, you used G-H-T when the correct spelling is G-T-H (the last two letters are swapped). I've made that typo before. I find having identifiers spelled correctly helps with reading and finding them, although the autocomplete in IDEs mitigates that a little but propagates the misspellings.
$endgroup$
– 1201ProgramAlarm
2 days ago
$begingroup$
@1201ProgramAlarm ooh, 😮 how come I didn't notice this after revising it multiple times!, thanks.
$endgroup$
– Accountant م
2 days ago
add a comment |
2
$begingroup$
From a readability viewpoint, you should use NULL instead of (char*) 0 as it is easier to recognize what you're trying to do. Also, the tokLenght misspells "length", and should probably be tokLength.
You leak memory, as the memory allocated to hold the returned string is never freed.
answered Apr 6 at 0:57
1201ProgramAlarm1201ProgramAlarm
3,7232925
$endgroup$
$begingroup$
Thank you very much I will use NULL from now on, and I will remember tofree()memory , 'I miss PHP garbage collector :(', I didn't get thetokLengthspelling note, aren't they the same ?
$endgroup$
– Accountant م
Apr 6 at 1:42
1
$begingroup$
It's a matter of style, and including.hif you want to useNULL. However, you don't have to cast(char *)0, just use0(orNULL.) It knows from the return type.
$endgroup$
– Neil Edelman
Apr 6 at 2:03
1
$begingroup$
@Accountantم For the spelling, you used G-H-T when the correct spelling is G-T-H (the last two letters are swapped). I've made that typo before. I find having identifiers spelled correctly helps with reading and finding them, although the autocomplete in IDEs mitigates that a little but propagates the misspellings.
$endgroup$
– 1201ProgramAlarm
2 days ago
$begingroup$
@1201ProgramAlarm ooh, 😮 how come I didn't notice this after revising it multiple times!, thanks.
$endgroup$
– Accountant م
2 days ago
add a comment |
2
2
2
$begingroup$
From a readability viewpoint, you should use NULL instead of (char*) 0 as it is easier to recognize what you're trying to do. Also, the tokLenght misspells "length", and should probably be tokLength.
You leak memory, as the memory allocated to hold the returned string is never freed.
answered Apr 6 at 0:57
1201ProgramAlarm1201ProgramAlarm
3,7232925
$endgroup$
From a readability viewpoint, you should use NULL instead of (char*) 0 as it is easier to recognize what you're trying to do. Also, the tokLenght misspells "length", and should probably be tokLength.
You leak memory, as the memory allocated to hold the returned string is never freed.
answered Apr 6 at 0:57
1201ProgramAlarm1201ProgramAlarm
3,7232925
answered Apr 6 at 0:57
1201ProgramAlarm1201ProgramAlarm
3,7232925
answered Apr 6 at 0:57
1201ProgramAlarm1201ProgramAlarm
3,7232925
answered Apr 6 at 0:57
1201ProgramAlarm1201ProgramAlarm
3,7232925
3,7232925
$begingroup$
Thank you very much I will use NULL from now on, and I will remember tofree()memory , 'I miss PHP garbage collector :(', I didn't get thetokLengthspelling note, aren't they the same ?
$endgroup$
– Accountant م
Apr 6 at 1:42
1
$begingroup$
It's a matter of style, and including.hif you want to useNULL. However, you don't have to cast(char *)0, just use0(orNULL.) It knows from the return type.
$endgroup$
– Neil Edelman
Apr 6 at 2:03
1
$begingroup$
@Accountantم For the spelling, you used G-H-T when the correct spelling is G-T-H (the last two letters are swapped). I've made that typo before. I find having identifiers spelled correctly helps with reading and finding them, although the autocomplete in IDEs mitigates that a little but propagates the misspellings.
$endgroup$
– 1201ProgramAlarm
2 days ago
$begingroup$
@1201ProgramAlarm ooh, 😮 how come I didn't notice this after revising it multiple times!, thanks.
$endgroup$
– Accountant م
2 days ago
add a comment |
$begingroup$
Thank you very much I will use NULL from now on, and I will remember tofree()memory , 'I miss PHP garbage collector :(', I didn't get thetokLengthspelling note, aren't they the same ?
$endgroup$
– Accountant م
Apr 6 at 1:42
1
$begingroup$
It's a matter of style, and including.hif you want to useNULL. However, you don't have to cast(char *)0, just use0(orNULL.) It knows from the return type.
$endgroup$
– Neil Edelman
Apr 6 at 2:03
1
$begingroup$
@Accountantم For the spelling, you used G-H-T when the correct spelling is G-T-H (the last two letters are swapped). I've made that typo before. I find having identifiers spelled correctly helps with reading and finding them, although the autocomplete in IDEs mitigates that a little but propagates the misspellings.
$endgroup$
– 1201ProgramAlarm
2 days ago
$begingroup$
@1201ProgramAlarm ooh, 😮 how come I didn't notice this after revising it multiple times!, thanks.
$endgroup$
– Accountant م
2 days ago
$begingroup$
Thank you very much I will use NULL from now on, and I will remember to
free() memory , 'I miss PHP garbage collector :(', I didn't get the tokLength spelling note, aren't they the same ?$endgroup$
– Accountant م
Apr 6 at 1:42
$begingroup$
Thank you very much I will use NULL from now on, and I will remember to
free() memory , 'I miss PHP garbage collector :(', I didn't get the tokLength spelling note, aren't they the same ?$endgroup$
– Accountant م
Apr 6 at 1:42
1
1
$begingroup$
It's a matter of style, and including
.h if you want to use NULL. However, you don't have to cast (char *)0, just use 0 (or NULL.) It knows from the return type.$endgroup$
– Neil Edelman
Apr 6 at 2:03
$begingroup$
It's a matter of style, and including
.h if you want to use NULL. However, you don't have to cast (char *)0, just use 0 (or NULL.) It knows from the return type.$endgroup$
– Neil Edelman
Apr 6 at 2:03
1
1
$begingroup$
@Accountantم For the spelling, you used G-H-T when the correct spelling is G-T-H (the last two letters are swapped). I've made that typo before. I find having identifiers spelled correctly helps with reading and finding them, although the autocomplete in IDEs mitigates that a little but propagates the misspellings.
$endgroup$
– 1201ProgramAlarm
2 days ago
$begingroup$
@Accountantم For the spelling, you used G-H-T when the correct spelling is G-T-H (the last two letters are swapped). I've made that typo before. I find having identifiers spelled correctly helps with reading and finding them, although the autocomplete in IDEs mitigates that a little but propagates the misspellings.
$endgroup$
– 1201ProgramAlarm
2 days ago
$begingroup$
@1201ProgramAlarm ooh, 😮 how come I didn't notice this after revising it multiple times!, thanks.
$endgroup$
– Accountant م
2 days ago
$begingroup$
@1201ProgramAlarm ooh, 😮 how come I didn't notice this after revising it multiple times!, thanks.
$endgroup$
– Accountant م
2 days ago
add a comment |
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1
$begingroup$
Better user-interface then the original
strtok. You may be interested instrsep, too. code.woboq.org/userspace/glibc/string/strsep.c.html$endgroup$
– Neil Edelman
Apr 6 at 1:59
$begingroup$
@NeilEdelman thanks I never saw this function before, I will check it.
$endgroup$
– Accountant م
Apr 6 at 2:09
1
$begingroup$
It's not in the standard
Clibraries, but inPOSIX, (any type ofgcc.) However, likestrtok, it obliterates thecharto replace it with, so it's not the same.$endgroup$
– Neil Edelman
Apr 6 at 2:17