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Top Forums Programming 'strlen' of a constant string Post 302224609 by redoubtable on Wednesday 13th of August 2008 02:20:57 PM
Old 08-13-2008
Quote:
Taking the 'const' doesn't make any difference. I could use 'sizeof', but it gives one greater than the length (is it counting a null terminator?). I'm not sure why it says it's not constant as I'm doing a strlen on a pair of constant strings, so their length can't change.
sizeof() is not the same as strlen(). sizeof() gives you the size of the array. Whereas strlen() counts the number of chars in the array until a '\0' is found. Your problem is totally related to the compiler (gcc in your case).

Those declarations are global right? Try declaring them global but without assigning the value of comment_begin_len and comment_end_len.

Do something like:
Code:
char comment_begin[] = "<!--";
char comment_end[] = "-->";

int comment_begin_len;
int comment_end_len;

...

int
main()
{
...
       comment_begin_len = strlen (comment_begin);
       comment_end_len = strlen(comment_end);
...
}

 

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STRING(3)						     Linux Programmer's Manual							 STRING(3)

NAME
stpcpy, strcasecmp, strcat, strchr, strcmp, strcoll, strcpy, strcspn, strdup, strfry, strlen, strncat, strncmp, strncpy, strncasecmp, strp- brk, strrchr, strsep, strspn, strstr, strtok, strxfrm, index, rindex - string operations SYNOPSIS
#include <strings.h> int strcasecmp(const char *s1, const char *s2); int strncasecmp(const char *s1, const char *s2, size_t n); char *index(const char *s, int c); char *rindex(const char *s, int c); #include <string.h> char *stpcpy(char *dest, const char *src); char *strcat(char *dest, const char *src); char *strchr(const char *s, int c); int strcmp(const char *s1, const char *s2); int strcoll(const char *s1, const char *s2); char *strcpy(char *dest, const char *src); size_t strcspn(const char *s, const char *reject); char *strdup(const char *s); char *strfry(char *string); size_t strlen(const char *s); char *strncat(char *dest, const char *src, size_t n); int strncmp(const char *s1, const char *s2, size_t n); char *strncpy(char *dest, const char *src, size_t n); char *strpbrk(const char *s, const char *accept); char *strrchr(const char *s, int c); char *strsep(char **stringp, const char *delim); size_t strspn(const char *s, const char *accept); char *strstr(const char *haystack, const char *needle); char *strtok(char *s, const char *delim); size_t strxfrm(char *dest, const char *src, size_t n); DESCRIPTION
The string functions perform string operations on null-terminated strings. See the individual man pages for descriptions of each function. SEE ALSO
index(3), rindex(3), strcasecmp(3), stpcpy(3), strcat(3), strchr(3), strcmp(3), strcoll(3), strcpy(3), strcspn(3), strdup(3), strfry(3), strlen(3), strncasecmp(3), strncat(3), strncmp(3), strncpy(3), strpbrk(3), strrchr(3), strsep(3), strspn(3), strstr(3), strtok(3), strxfrm(3) COLOPHON
This page is part of release 3.25 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/. 2010-02-25 STRING(3)
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