stm32f103 neopixel demo simulating water / waving based on ultrasonic stimulus. This is an earlier version of what later became the "spatial-rgb" project
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f103-wave-sim/project/utils/str_utils.h

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#pragma once
#include <stdint.h>
#include <stdbool.h>
#include <string.h>
#define streq(a, b) (strcmp((a), (b)) == 0)
#define streqi(a, b) (strcasecmp((a), (b)) == 0)
/**
* Escape string, storing result in a buffer.
*/
void str_escape(char *dest, const char *src, size_t dest_len);
/**
* Escape special chars in a string, IN PLACE.
*
* If string is too long after escaping, last chars are dropped.
*
* @param buf the buffer, containing 0-terminated string.
* @param buflen buffer length
*/
void str_escape_ip(char *buf, size_t buf_len);
/**
* Get position of needle in a haystack.
* -1 if not found.
*/
int32_t strpos(const char *haystack, const char *needle);
/**
* Find substring position, ending at index 'limit'.
* Limit <= 0 means no limit.
* Returns index of the first character of needle in haystack.
*/
int32_t strpos_upto(const char *haystack, const char *needle, size_t limit);
/**
* Find substring position, ending when endmatch is encountered. (Substring within endmatch *can* be reported).
* Returns index of the first character of needle in haystack.
*/
int32_t strpos_upto_match(const char *haystack, const char *needle, const char *endmatch);
/**
* Like sprintf, except without formatting
*/
size_t str_copy(char * dest, const char *src);
/**
* Decode url-encoded string, store result in dest.
*/
void urldecode(char *dest, const char *src);
/**
* Decode url-encoded string in place.
*/
void urldecode_ip(char *str);
/**
* Retrieve & url-decode a query string value by name.
*
* @param buffer - target buffer
* @param querystring - string (foo=bar&baz=moi)
* @param key - key to retrieve
* @param buf_len - length of the target buffer
* @return true if found.
*/
bool get_query_value(char *buffer, const char *querystring, const char *key, size_t buf_len);