53 lines
1.4 KiB
C
53 lines
1.4 KiB
C
#include "std.h"
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char* _strcat_malloc(size_t n, cstr str0, ...){
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va_list argv;
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va_start(argv, str0);
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char* heap_ptr = _vstrcat_malloc(n, str0, argv);
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va_end(argv);
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return heap_ptr;
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}
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char* _vstrcat_malloc(size_t n, cstr str0, va_list argv){
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size_t str0_len = strlen(str0);
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size_t total_len = str0_len;
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cstr* const parts = malloc(sizeof(cstr) * n);
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size_t* const part_lengths = malloc(sizeof(size_t) * n);
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for(size_t i = 0; i < n; i++){
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cstr part = va_arg(argv, cstr);
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size_t length = strlen(part);
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parts[i] = part;
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part_lengths[i] = length;
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total_len += length;
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}
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char* const buf = malloc(total_len + 1);
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memcpy(buf, str0, str0_len);
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char* walking_ptr = buf + str0_len;
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for(size_t i = 0; i < n; i++){
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memcpy(walking_ptr, parts[i], part_lengths[i]);
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walking_ptr += part_lengths[i];
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}
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buf[total_len] = '\0';
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free(parts);
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free(part_lengths);
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return buf;
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}
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char* NULLABLE(sprintf_malloc)(size_t buffer_size, cstr format, ...){
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va_list argv;
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va_start(argv, format);
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char* NULLABLE(heap_ptr) = vsprintf_malloc(buffer_size, format, argv);
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va_end(argv);
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return heap_ptr;
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}
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char* NULLABLE(vsprintf_malloc)(size_t buffer_size, cstr format, va_list argv){
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char* buf = malloc(buffer_size);
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int r = vsprintf_s(buf, buffer_size, format, argv);
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if(r < 0){
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free(buf);
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return NULL;
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}
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return buf;
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}
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