roo_e/shared/util.c

#include "array.h"

#include "util.h"


char __scratch[SCRATCH_SIZE];


void utilBitsPrint(uint8_t byte) {
	int i = 0;

	for (i = 7; 0 <= i; i--) {
		printf("%c", (byte & (1 << i)) ? '1' : '0');
	}
}


char *utilCreateString(char *format, ...) {
	va_list  args;
	char    *string;

	va_start(args, format);
	string = utilCreateStringVArgs(format, args);
	va_end(args);

	return string;
}


__attribute__((__format__(__printf__, 1, 0)))
char *utilCreateStringVArgs(char *format, va_list args) {
	va_list  argsCopy;
	int32_t  size     = 0;
	char    *buffer   = NULL;

	va_copy(argsCopy, args);
	size = vsnprintf(NULL, 0, format, argsCopy) + 1;
	va_end(argsCopy);
	buffer = calloc(1, (size_t)size);
	if (buffer) {
		vsnprintf(buffer, (size_t)size, format, args);
	}

	return buffer;
}


void utilDie(const char *why, ...) {
	va_list args;
	char    msg[2048];

	va_start(args, why);
	vsprintf(msg, why, args);
	va_end(args);

	logWrite("DIE:  %s", msg);
	exit(1);
}


uint8_t utilFileExists(char *filename) {
	FILE *f = fopen(filename, "rb");

	if (f) {
		fclose(f);
		return SUCCESS;
	}

	return FAIL;
}


char *utilFileExtensionChange(char *appName, char *extension) {
	char     *c       = NULL;
	char     *newName = NULL;
	int16_t   x       = strlen(appName);
	uint16_t  len     = 2 + strlen(extension);  // 2 = dot in extension and 0 terminator.

	// Find last portion of filename.
	while (x > 0) {
		if (appName[x] == '/' || appName[x] == '\\') { x++;  break; }
		x--;
		len++;
	}
	x--;

	// We use this + length of new extension for new string length.
	newName = (char *)malloc(len);
	if (newName) {
		if (strlen(appName) - x < len) {
			// Replace extension
			strncpy(newName, &appName[x + 1], len - 1);
			c = strstr(newName, ".");
			if (c) *c = 0;
			strncat(newName, ".", len - 1);
			strncat(newName, extension, len - 1);
		}
	}

	return newName;
}


uint8_t utilFromFileReadByte(FILE *f,  uint8_t *result) {
	unsigned char c;

	// Get next byte.
	c = fgetc(f);
	// End of file?
	if (feof(f)) return FAIL;
	// Add to result.
	*result = c;
	return SUCCESS;
}


uint8_t utilFromFileReadString(FILE *f, char **result) {
	unsigned char c;
	uint16_t      x = 0;

	// Something already in 'result'?
	DEL(*result);

	while (1) {
		// Get next byte.
		c = fgetc(f);
		// End of file?
		if (feof(f)) return FAIL;
		// Add to result.
		__scratch[x++] = c;
		__scratch[x]   = 0;
		// End of string?
		if (c == 0) {
			*result = strdup(__scratch);
			return SUCCESS;
		}
	}
}


void utilStringToLower(char *string) {
	uint16_t i;

	for (i=0; i<strlen(string); i++) string[i] = tolower(string[i]);
}


char **utilWrapText(char *text, uint16_t width) {
	char    **lines  = NULL;
	char     *head   = text;
	char     *buffer = NULL;
	int32_t   bufferPos;
	int32_t   pos;
	int32_t   lastSpace;
	int32_t   isLf;

	buffer = (char *)malloc(width + 2);
	if (buffer) {
		pos = lastSpace = bufferPos = 0;
		while (head[pos] != 0) {
			isLf = (head[pos] == '\n');
			if (isLf || pos == width) {
				if (isLf || lastSpace == 0) lastSpace = pos; // just cut it
				while (*head!=0 && lastSpace-- > 0) {
					buffer[bufferPos++] = *head++;
					buffer[bufferPos]   = 0;
				}
				arrput(lines, strdup(buffer));
				if (isLf) head++; // jump the line feed
				while (*head!=0 && *head==' ') head++; // clear the leading space
				lastSpace = pos = bufferPos = 0;
			} else {
				if (head[pos] == ' ') lastSpace = pos;
				pos++;
			}
		}
		arrput(lines, strdup(head));
		free(buffer);
	}

	return lines;
}