C++按单词换行的函数,按照指定的长度对字符串进行换行,如果指定的长度正好在某个单词中间,就往回查找,直到出现空格再换行
/* This function takes a string and an output buffer and a desired width. It then copies the string to the buffer, inserting a new line character when a certain line length is reached. If the end of the line is in the middle of a word, it will backtrack along the string until white space is found. */ #include <string.h> #include <ctype.h> char* word_wrap (char* buffer, char* string, int line_width) { int i = 0; int k, counter; while(i < strlen( string ) ) { // copy string until the end of the line is reached for ( counter = 1; counter <= line_width; counter++ ) { // check if end of string reached if ( i == strlen( string ) ) { buffer[ i ] = 0; return buffer; } buffer[ i ] = string[ i ]; // check for newlines embedded in the original input // and reset the index if ( buffer[ i ] == '\n' ) { counter = 1; } i++; } // check for whitespace if ( isspace( string[ i ] ) ) { buffer[i] = '\n'; i++; } else { // check for nearest whitespace back in string for ( k = i; k > 0; k--) { if ( isspace( string[ k ] ) ) { buffer[ k ] = '\n'; // set string index back to character after this one i = k + 1; break; } } } } buffer[ i ] = 0; return buffer;