98 lines
2.2 KiB
C
98 lines
2.2 KiB
C
/*
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function for format output to the string. much lighter than standard sprintf
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because of lesser formats supported
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*/
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#include <string.h>
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//#include <stdio.h>
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#include <ctype.h>
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#include <stdarg.h>
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char* __itoa(int n,char* s);
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char* itoab(unsigned int n, char* s, int b);
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int tiny_vsnprintf (char * s, size_t n, const char * format, va_list args )
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// support %c, %s, %d, %x, %u, %% for 32-bit values only. no width specs, left align
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// always zero-ended
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{
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char *fmt, *dest, buf[32];
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fmt = (char*)format;
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dest = s; dest[n - 1] = '\0';
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int arg, len;
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while (*fmt && (dest - s < n - 1))
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{
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if (*fmt != '%')
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{
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*dest++ = *fmt++;
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continue;
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}
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if (fmt[1] == '%') // %%
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{
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*dest++ = '%';
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fmt += 2;
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continue;
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}
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arg = va_arg(args, int);
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len = n - 1 - (dest - s);
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switch (*++fmt)
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{
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case 'c':
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*dest++ = (char)arg;
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break;
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case 's':
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strncpy(dest, (char*)arg, len);
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dest = strchr(dest, 0);
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break;
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case 'd':
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__itoa(arg, buf);
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strncpy(dest, buf, len);
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dest = strchr(dest, 0);
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break;
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case 'x':
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itoab((unsigned)arg, buf, 16);
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strncpy(dest, buf, len);
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dest = strchr(dest, 0);
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break;
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case 'u':
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itoab((unsigned)arg, buf, 10);
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strncpy(dest, buf, len);
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dest = strchr(dest, 0);
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break;
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default:
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*dest++ = *fmt;
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}
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fmt++;
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}
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*dest = '\0';
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return dest - s;
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}
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int tiny_snprintf (char * s, size_t n, const char * format, ... )
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{
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va_list arg;
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int rc;
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va_start(arg, format);
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rc = tiny_vsnprintf(s, n, format, arg);
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va_end(arg);
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return rc;
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}
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int tiny_sprintf (char * s, const char * format, ... )
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{
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va_list arg;
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int rc;
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va_start(arg, format);
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rc = tiny_vsnprintf(s, 4096, format, arg);
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va_end(arg);
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return rc;
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}
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