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137 lines
3.4 KiB
137 lines
3.4 KiB
//
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// Created by MightyPork on 2017/12/01.
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//
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// Utility for generating a INI file with support for extracting individual sectors
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// and measuring total length without buffering. This is used to build the INI files
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// for the VFS and config.
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//
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#ifndef INIWRITER_H
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#define INIWRITER_H
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#include "platform.h"
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/**
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* INI writer handle
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*/
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typedef struct iniwriter_ {
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char *ptr;
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uint32_t skip;
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uint32_t count;
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uint32_t tag; // general purpose field (used to identify for which purpose is the file being read)
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} IniWriter;
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/**
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* IniWriter helper buffer, available within a IW-scope only.
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*
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* This buffer is used internally by printf-like iw functions.
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* It can be used to prepare buffer for iw_buff or iw_string,
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* but must NOT be used for %s substitutions in iw_* functions.
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*/
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extern char *iwbuffer;
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/** Allocate the helper buffer */
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void iw_begin(void);
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/** Release the helper buffer */
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void iw_end(void);
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/**
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* Initialize a IniWriter struct (macro)
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*
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* @param buffer - buffer backing the writer, result will be written here
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* @param skip - number of written bytes to skip
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* @param count - number of bytes to write, truncate rest
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* @return structure initializer
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*/
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#define iw_init(xbuffer, xskip, xcount) (IniWriter){.ptr=(xbuffer), .skip=(xskip), .count=(xcount)}
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/**
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* Try to write a buffer to the file
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*
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* @param iw - iniwriter handle
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* @param buf - buffer to write
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* @param len - buffer len
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*/
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void iw_buff(IniWriter *iw, const uint8_t *buf, uint32_t len);
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/**
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* Try to write a string to the file
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*
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* @param iw - iniwriter handle
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* @param str - string to write
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*/
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static inline void iw_string(IniWriter *iw, const char *str)
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{
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if (iw->count != 0) {
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iw_buff(iw, (uint8_t *) str, (uint32_t) strlen(str));
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}
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}
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void iw_cmt_newline(IniWriter *iw);
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#define iw_newline(iw) iw_string(iw, "\r\n")
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/**
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* Try to snprintf to the file
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*
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* @param iw - iniwriter handle
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* @param format - format, like printf
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* @param ... - replacements
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*/
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void iw_sprintf(IniWriter *iw, const char *format, ...)
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__attribute__((format(printf,2,3)));
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// High level stuff
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/**
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* Try to write a INI section header [foobar]\r\n
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* @param iw - iniwriter handle
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* @param format - format, like printf
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* @param ... - replacements
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*/
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void iw_section(IniWriter *iw, const char *format, ...)
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__attribute__((format(printf,2,3)));
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/**
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* Try to write a INI comment # blah\r\n
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* @param iw - iniwriter handle
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* @param text - format, like printf
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*/
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void iw_comment(IniWriter *iw, const char *text);
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/**
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* Try to write a INI comment # blah\r\n
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* @param iw - iniwriter handle
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* @param format - format, like printf
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* @param ... - replacements
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*/
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void iw_commentf(IniWriter *iw, const char *format, ...)
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__attribute__((format(printf,2,3)));
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/**
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* Same as iw_comment(), but ignores the systemsettings option to disable comments
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*/
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void iw_hdr_comment(IniWriter *iw, const char *format, ...)
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__attribute__((format(printf,2,3)));
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/**
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* Try to write a key-value entry
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*
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* @param iw - iniwriter handle
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* @param key - key
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* @param format - value format (like printf)
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* @param ... - replacements
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*/
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void iw_entry(IniWriter *iw, const char *key, const char *format, ...)
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__attribute__((format(printf,3,4)));
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/**
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* Measure total ini writer length using a dummy write
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*
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* @param handler - function that normally writes to the writer
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* @return byte count
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*/
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uint32_t iw_measure_total(void (*handler)(IniWriter *), uint32_t tag);
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#endif //INIWRITER_H
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