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# legato-util
Small collection of helper functions required by some of our open source code
## API
### File I/O
Functions to handle boilerplate when reading and writing from files.
```C
le_result_t readFromFile (const char *path, void *value,
int (*scanCallback) (FILE *f, void *val));
int scanIntCallback (FILE *f, void *value);
int scanDoubleCallback (FILE *f, void *value);
le_result_t ioutil_readIntFromFile (const char *path, int *value);
le_result_t ioutil_readDoubleFromFile (const char *filePath, double *value);
le_result_t ioutil_writeToFile (const char *path, void *value, size_t size, size_t count);
```
### GPIO
Functions to manipulate sysfs GPIO.
```C
void getGpioPath (char *outputStr, int pin, char *subDir);
le_result_t gpio_exportPin (int pin);
le_result_t gpio_unexportPin (int pin);
le_result_t gpio_setDirection (int pin, char *direction);
le_result_t gpio_setInput (int pin);
le_result_t gpio_setOutput (int pin);
le_result_t gpio_setActiveState (int pin, bool isActiveLow);
le_result_t gpio_isActive (int pin, bool *isActive);
le_result_t gpio_setValue (int pin, bool state);
le_result_t gpio_setLow (int pin);
le_result_t gpio_setHigh (int pin);
```
### Timing
Functions to help with sample timing. Could potentially be replaced with system calls
```C
// TODO give these a quasi "namespace"
void delayMicro (unsigned long microsecs);
void delayMilli (unsigned long millisecs);
long getTimeMicrosecs ();
```
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