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      1 /**
      2  * @file op_string.c
      3  * general purpose C string handling implementation.
      4  *
      5  * @remark Copyright 2003 OProfile authors
      6  * @remark Read the file COPYING
      7  *
      8  * @author John Levon
      9  * @author Philippe Elie
     10  */
     11 
     12 #include <string.h>
     13 #include "op_libiberty.h"
     14 
     15 
     16 char * op_xstrndup(char const * s, size_t len)
     17 {
     18 	return xmemdup(s, len, len + 1);
     19 }
     20 
     21 
     22 size_t op_hash_string(char const * str)
     23 {
     24 	size_t hash = 0;
     25 	for (; *str; ++str)
     26 		hash ^= (hash << 16) ^ (hash >> 8) ^ *str;
     27 	return hash;
     28 }
     29 
     30 
     31 int strisprefix(char const * str, char const * prefix)
     32 {
     33 	return strstr(str, prefix) == str;
     34 }
     35 
     36 
     37 char const * skip_ws(char const * c)
     38 {
     39 	while (*c == ' ' || *c == '\t' || *c == '\n')
     40 		++c;
     41 	return c;
     42 }
     43 
     44 
     45 char const * skip_nonws(char const * c)
     46 {
     47 	while (*c && *c != ' ' && *c != '\t' && *c != '\n')
     48 		++c;
     49 	return c;
     50 }
     51 
     52 
     53 int empty_line(char const * c)
     54 {
     55 	return !*skip_ws(c);
     56 }
     57 
     58 
     59 int comment_line(char const * c)
     60 {
     61 	return *skip_ws(c) == '#';
     62 }
     63