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A modern, network-enabled music player platform built on Rockbox technology. rockboxd.tsiry-sandratraina.com
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2.2 kB · 79 lines
C
at master
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/* * Minimal printf and snprintf formatting functions * * These support %c %s %l %d %u and %x(%p) * Field width and zero-padding flag only */
#include <stdio.h>#include <stdarg.h>#include <stdbool.h>#include <limits.h>#include "format.h"
struct for_snprintf { unsigned char *ptr; /* where to store it */ size_t bytes; /* amount already stored */ size_t max; /* max amount to store */};
static int sprfunc(void *ptr, unsigned char letter){ struct for_snprintf *pr = (struct for_snprintf *)ptr; if(pr->bytes < pr->max) { *pr->ptr = letter; pr->ptr++; pr->bytes++; return true; } return false; /* filled buffer */}
int snprintf(char *buf, size_t size, const char *fmt, ...){ int len; va_list ap;
va_start(ap, fmt); len = vsnprintf(buf, size, fmt, ap); va_end(ap);
return len;}
int vsnprintf(char *buf, size_t size, const char *fmt, va_list ap){ struct for_snprintf pr;
pr.ptr = (unsigned char *)buf; pr.bytes = 0; pr.max = size;
format(sprfunc, &pr, fmt, ap);
/* make sure it ends with a trailing zero */ pr.ptr[(pr.bytes < pr.max) ? 0 : -1] = '\0';
return pr.bytes;}