ref: 83f8d591689cae964ba58fbcf172f6a4fa7003ed
dir: /sys/src/libc/port/tokenize.c/
#include <u.h> #include <libc.h> static char qsep[] = " \t\r\n"; static char* qtoken(char *s, char *sep) { int quoting; char *t; quoting = 0; t = s; /* s is output string, t is input string */ while(*t!='\0' && (quoting || utfrune(sep, *t)==nil)){ if(*t != '\''){ *s++ = *t++; continue; } /* *t is a quote */ if(!quoting){ quoting = 1; t++; continue; } /* quoting and we're on a quote */ if(t[1] != '\''){ /* end of quoted section; absorb closing quote */ t++; quoting = 0; continue; } /* doubled quote; fold one quote into two */ t++; *s++ = *t++; } if(*s != '\0'){ *s = '\0'; if(t == s) t++; } return t; } static char* etoken(char *t, char *sep) { int quoting; /* move to end of next token */ quoting = 0; while(*t!='\0' && (quoting || utfrune(sep, *t)==nil)){ if(*t != '\''){ t++; continue; } /* *t is a quote */ if(!quoting){ quoting = 1; t++; continue; } /* quoting and we're on a quote */ if(t[1] != '\''){ /* end of quoted section; absorb closing quote */ t++; quoting = 0; continue; } /* doubled quote; fold one quote into two */ t += 2; } return t; } int gettokens(char *s, char **args, int maxargs, char *sep) { int nargs; for(nargs=0; nargs<maxargs; nargs++){ while(*s!='\0' && utfrune(sep, *s)!=nil) *s++ = '\0'; if(*s == '\0') break; args[nargs] = s; s = etoken(s, sep); } return nargs; } int tokenize(char *s, char **args, int maxargs) { int nargs; for(nargs=0; nargs<maxargs; nargs++){ while(*s!='\0' && utfrune(qsep, *s)!=nil) s++; if(*s == '\0') break; args[nargs] = s; s = qtoken(s, qsep); } return nargs; }