Changeset 75c430e3 in mainline for uspace/lib/posix/src/stdlib.c


Ignore:
Timestamp:
2018-06-19T11:48:03Z (7 years ago)
Author:
Jiri Svoboda <jiri@…>
Branches:
lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export
Children:
47be512
Parents:
6c440362
git-author:
Jiri Svoboda <jiri@…> (2018-06-18 17:47:07)
git-committer:
Jiri Svoboda <jiri@…> (2018-06-19 11:48:03)
Message:

Bsearch, getenv, system need to go to libc. (although we might eventually want different implementation for POSIX mode.)

File:
1 edited

Legend:

Unmodified
Added
Removed

  • uspace/lib/posix/src/stdlib.c

    r6c440362 r75c430e3  
    8484
    8585/**
    86  * Binary search in a sorted array.
    87  *
    88  * @param key Object to search for.
    89  * @param base Pointer to the first element of the array.
    90  * @param nmemb Number of elements in the array.
    91  * @param size Size of each array element.
    92  * @param compar Comparison function.
    93  * @return Pointer to a matching element, or NULL if none can be found.
    94  */
    95 void *bsearch(const void *key, const void *base,
    96     size_t nmemb, size_t size, int (*compar)(const void *, const void *))
    97 {
    98         while (nmemb > 0) {
    99                 const void *middle = base + (nmemb / 2) * size;
    100                 int cmp = compar(key, middle);
    101                 if (cmp == 0) {
    102                         return (void *) middle;
    103                 }
    104                 if (middle == base) {
    105                         /*
    106                          * There is just one member left to check and it
    107                          * didn't match the key. Avoid infinite loop.
    108                          */
    109                         break;
    110                 }
    111                 if (cmp < 0) {
    112                         nmemb = nmemb / 2;
    113                 } else if (cmp > 0) {
    114                         nmemb = nmemb - (nmemb / 2);
    115                         base = middle;
    116                 }
    117         }
    118 
    119         return NULL;
    120 }
    121 
    122 /**
    123  * Retrieve a value of the given environment variable.
    124  *
    125  * Since HelenOS doesn't support env variables at the moment,
    126  * this function always returns NULL.
    127  *
    128  * @param name Name of the variable.
    129  * @return Value of the variable or NULL if such variable does not exist.
    130  */
    131 char *getenv(const char *name)
    132 {
    133         return NULL;
    134 }
    135 
    136 /**
    13786 *
    13887 * @param name
    … …  
    14392{
    14493        // TODO: low priority, just a compile-time dependency of binutils
    145         not_implemented();
    146         return 0;
    147 }
    148 
    149 /**
    150  * Issue a command.
    151  *
    152  * @param string String to be passed to a command interpreter or NULL.
    153  * @return Termination status of the command if the command is not NULL,
    154  *     otherwise indicate whether there is a command interpreter (non-zero)
    155  *     or not (zero).
    156  */
    157 int system(const char *string)
    158 {
    159         // TODO: does nothing at the moment
    16094        not_implemented();
    16195        return 0;
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