printf/printfC.c

#include <errno.h>
#include <string.h>
#include "ft_printf_internal.h"

int padString(struct printf_data* data, int len)
{
    int padLen = 0;
    int sysCallRet;

    while (len > 0)
    {
        sysCallRet = printfWrite(data, " ", 1);
        if (sysCallRet < 0)
            return sysCallRet;
        padLen += sysCallRet;
        --len;
    }
    return padLen;
}

int printf_c(struct printf_data* data, struct printf_format_params* format, va_list args)
{
    char c = (char) va_arg(args, int);
    int len = format->width -1;
    int padLen = 0;
    int sysCallRet;

    padLen = padString(data, len);
    if (padLen < 0)
        return padLen;
    sysCallRet = printfWrite(data, &c, 1);
    if (sysCallRet < 0)
        return sysCallRet;
    return sysCallRet + padLen;
}

int printfString(struct printf_data* data, struct printf_format_params* format, const char* str)
{
    int len = strlen(str);
    int pad = format->width;

    if (format->precision >= 0 && len > format->precision)
        len = format->precision;
    if (pad >= 0)
        pad = pad - len;
    pad = padString(data, pad);
    if (pad < 0)
        return pad;
    len = printfWrite(data, str, len);
    if (len < 0)
        return len;
    return pad + len;
}

int printf_s(struct printf_data* data, struct printf_format_params* format, va_list args)
{
    const char* str = va_arg(args, const char*);
    return printfString(data, format, str == NULL ? "(null)" : str);
}

int printf_m(struct printf_data* data, struct printf_format_params* format, va_list args)
{
    (void) args;
    return printfString(data, format, strerror(errno));
}