use option “all” but only the end page

[chengruo]

				while (1) {
					size_t _wr_len = snprintf(svgFilenameBuffer, svgFilenameBufLen, svgFilename, pageInd + 1);
					if (_wr_len >= svgFilenameBufLen) {
						svgFilenameBufLen = _wr_len + 1;
						svgFilenameBuffer = (char*)realloc(svgFilenameBuffer, svgFilenameBufLen);
						assert(svgFilenameBuffer != NULL);
						continue;
					}
					break;
				}

modify here can work

[kapfab]

@dawbarton, could you merge the latest commits from https://github.com/JackieFei/pdf2svg?
HomeBrew points to your repository and the resulting binary is buggy…