release/src/router/busybox/libbb/compare_string_array.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * Licensed under GPLv2 or later, see file LICENSE in this source tree.
   4  */
   5
   6 #include "libbb.h"
   7
   8 /* returns the array index of the string */
   9 /* (index of first match is returned, or -1) */
  10 int FAST_FUNC index_in_str_array(const char *const string_array[], const char *key)
  11 {
  12         int i;
  13
  14         for (i = 0; string_array[i] != 0; i++) {
  15                 if (strcmp(string_array[i], key) == 0) {
  16                         return i;
  17                 }
  18         }
  19         return -1;
  20 }
  21
  22 int FAST_FUNC index_in_strings(const char *strings, const char *key)
  23 {
  24         int idx = 0;
  25
  26         while (*strings) {
  27                 if (strcmp(strings, key) == 0) {
  28                         return idx;
  29                 }
  30                 strings += strlen(strings) + 1; /* skip NUL */
  31                 idx++;
  32         }
  33         return -1;
  34 }
  35
  36 /* returns the array index of the string, even if it matches only a beginning */
  37 /* (index of first match is returned, or -1) */
  38 #ifdef UNUSED
  39 int FAST_FUNC index_in_substr_array(const char *const string_array[], const char *key)
  40 {
  41         int i;
  42         int len = strlen(key);
  43         if (len) {
  44                 for (i = 0; string_array[i] != 0; i++) {
  45                         if (strncmp(string_array[i], key, len) == 0) {
  46                                 return i;
  47                         }
  48                 }
  49         }
  50         return -1;
  51 }
  52 #endif
  53
  54 int FAST_FUNC index_in_substrings(const char *strings, const char *key)
  55 {
  56         int matched_idx = -1;
  57         const int len = strlen(key);
  58
  59         if (len) {
  60                 int idx = 0;
  61                 while (*strings) {
  62                         if (strncmp(strings, key, len) == 0) {
  63                                 if (strings[len] == '\0')
  64                                         return idx; /* exact match */
  65                                 if (matched_idx >= 0)
  66                                         return -1; /* ambiguous match */
  67                                 matched_idx = idx;
  68                         }
  69                         strings += strlen(strings) + 1; /* skip NUL */
  70                         idx++;
  71                 }
  72         }
  73         return matched_idx;
  74 }
  75
  76 const char* FAST_FUNC nth_string(const char *strings, int n)
  77 {
  78         while (n) {
  79                 n--;
  80                 strings += strlen(strings) + 1;
  81         }
  82         return strings;
  83 }
  84
  85 #ifdef UNUSED_SO_FAR /* only brctl.c needs it yet */
  86 /* Returns 0 for no, 1 for yes or a negative value on error.  */
  87 smallint FAST_FUNC yesno(const char *str)
  88 {
  89         static const char no_yes[] ALIGN1 =
  90                 "0\0" "off\0" "no\0"
  91                 "1\0" "on\0" "yes\0";
  92         int ret = index_in_substrings(no_yes, str);
  93         return ret / 3;
  94 }
  95 #endif